WPI MICRO-ePORE™ Pinpoint Cell Penetrator

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Pinpoint Cell Penetrator for targeted cell microinjection and increased embryo viability 

  • Touch-screen display–resistive touch panel for use with gloves
  • Injection control through foot switch or manually through touch screen 
  • Intuitive user-interface 
  • User adjustable frequency and voltage through touch screen 
  • Small footprint 
  • Four user-programmable protocols 
  • Adjustable audio continuity tone indicating active probe injection counter to indicate total number of injections 
  • Uses smaller amount of voltage than electroporation to penetrate a specific area in the cell membrane

NOTE: Microinjection pump and other accessories shown in the system image are sold separately.




  • Increase embryo viability for the injected embryos
  • Flexible system
    • Integrates with WPI’s PV820/PV830, as well as other popular microinjection systems, like the Eppendorf Femtojet®  and the Narishige injectors (Femtojet® 4I is a registered Trademark of Eppendorf.)
    • Microinjection of diverse compounds and biomolecules – DNA, RNA, proteins
    • Pre- and post-implantation in embryos of various species – mice, rodents, monkeys, bovine, pigs, zebrafish, etc.
  • Easy to operate cell injector – Hands-free operation with foot switch control 
  • User adjustable frequency and voltage – four programmable protocols
  • Small, portable unit saves precious benchtop space
  • Works with all major inverted microscopes

Target Applications

  • Cell microinjection into oocytes and pre-implantation stage mammalian embryos, including microinjection of CRISPR-Cas9 reagents into the cytoplasm of two-cell stage embryos 
  • Pronuclear rodent zygote microinjection 
  • Gene silencing in zebrafish

Simple, Elegant Solution

The new WPI MICRO-ePORE™ pinpoint cell penetrator is a simple and versatile system that can be used for efficient cell microinjection of a diverse array of compounds and biomolecules into oocytes and pre-implantation stage mammalian embryos. Patent pending Flutter Electrode Technology assists in small, clean, precise membrane penetration without tearing or damaging the membrane when you are working on the microinjection of transgenic animals or cell manipulation.

micro-epore setup

Pinpoint Cell Penetrator vs. Electroporation

Electroporation uses a pulse of electricity in a medium to open pores in the cell membranes of cells in the electroporation cuvette in order to penetrate the cell membrane and introduce genetic material.

WPI's MICRO-ePORE™ Pinpoint Cell Penetrator offers several advantages over traditional electroporation for the purpose of cell microinjection. 

  • Our pinpoint cell microinjector uses a much lower voltage to open a port into the cell membrane.
  • Electroporation is a shotgun approach that opens many pores in the cell membrane. In contrast, our pinpoint cell microinjector targets a specific area of the cell membrane at the very point of cellular microinjection.
  • Embryo survivability is significantly higher when using pinpoint cell penetration versus electroporation.

Experimental Data

Electrophysiological systems utilizing negative capacitance have been routinely used for cell microinjection of a variety of biomolecules into mammalian oocytes, as well as pre-implantation and post-implantation embryos in developmental biology studies. The system which is no longer available, the intracellular amplifier WPI Cyto721, allows the needle to pierce the cell membrane with minimal physical trauma. More recently this technique has been applied to genetic transfer in the microinjection of CRISPR/Cas9 reagents into two-cell stage mouse embryos. The authors demonstrated significant increase in the knock-in efficiency and high viability of embryos using their method.

The new MICRO-ePORE™ pinpoint cell penetrator offers a unique solution for cell microinjection resulting in high embryo viability. The instrument creates an oscillating electric field at a localized site on the membrane immediately beneath the site of injection. The MICRO-ePORE™ creates small, reversible holes in the plasma membrane through which material is microinjected. The researcher determines the amplitude and frequency of the signal that best suits the application. In contrast to conventional cell microinjection, in targeted microinjection using the MICRO-ePORE™, the membrane does not tear and thus allows for superior embryo viability. The technique is simple and elegant. The new MICRO-ePORE™ cell penetrator prototype has been successfully tested in mouse and primate pre-implantation embryos, as well as gene silencing in zebrafish tails.

MICRO-ePORE™ was designed for a range of applications including generation of CRISPR/Cas9 mediated knock-in mice with large insertions by microinjection into two-cell stage embryos with high viability.7 The MICRO-ePORE™ has delivered accurate microinjection of morpholino oligomers (anti-sense “knockdown”) in zebrafish tails.

Well-Style Reference Electrode Option

Setup showing the well-style reference electrode

Probe-Style Reference Electrode Option

Setup showing the well-style reference electrode


This is showing the probe-style reference electrode with an Eppendorf injector, by Fangtao Chi of UCLA/MCDB and Utpal Banerjee.

Probe-style reference electrode

Setting up Your MICRO-ePORE™

The new WPI MICRO-ePORE™ Pinpoint Cell Penetrator is a simple and versatile system that can be used for efficient microinjection of a diverse array of compounds and biomolecules into oocytes and pre-implantation stage mammalian embryos. Patent pending Flutter Electrode Technology assists in small, clean, precise membrane penetration without tearing or damaging the membrane. Here Gabe sets up the system and connects all the components.


MICRO-ePORE™ Version 2
Rev. 2 (For units with serial numbers starting at 182508) 
MICRO-ePORE™ Version 1
Rev. 1 (For units with serial numbers up to 182508) 
Instruction Manual v2
Quick Start Guide v2
Instruction Manual v1 
Quick Start Guide v1



Is a reduction in embryo lysis possible using the MICRO-ePORE W.Gardiner, J.Kenyon, T.Bell, S.Atkins

System Includes:

(1) MICRO-ePORE™ controller
(1) Electrode holder with silver wire. Your choice of:
   • WPI #300863 WPI MICRO-ePORE Holder
   • WPI #300864 Femtojet® MICRO-ePORE Holder
   • WPI #300865 Narishige MICRO-ePORE™
(1) Microelectrode Holder Interface Cable
(1) Well-style Reference Electrode
(1) Probe-style Reference Electrode Assembly
(1) 13142 Foot Switch
(1) Power cord
(1) 99789 MICRO-ePORE™ Ground Cable
(1) Instruction Manual

Specifications Description
Voltage parameters 0–3.0 V, at 1 mV increments
Frequency parameters 50–3000 Hz, at 1 Hz increments
Pipette resistance alarm threshold maximum 500 MΩ
Dimensions 19.7 × 12.7 × 7.6 cm (7.75 × 5 × 3 in.) 
Weight 0.9 kg (2 lb.)
Certifications CE, RoHS

Bałakier H, Pedersen RA. Allocation of cells to inner cell mass and trophectoderm lineages in preimplantation mouse embryos. Dev Biol. 1982 Apr; 90(2):352-62. PMID: 7075865 (https://www.ncbi.nlm.nih.gov/pubmed/7075865)

Lawson KA, Pedersen RA. Cell fate, morphogenetic movement and population kinetics of embryonic endoderm at the time of germ layer formation in the mouse. Development. 1987 Nov;101(3):627-52. PMID:3502998 (https://www-ncbi-nlm-nih-gov.myaccess.library.utoronto.ca/pubmed/3502998)

Wianny F, Zernicka-Goetz M. Specific interference with gene function by double-stranded RNA in early mouse development. Nat Cell Biol. 2000 Feb; 2(2):70-5. PMID:10655585 (https://www.ncbi.nlm.nih.gov/pubmed/10655585)

Chazaud C, Yamanaka Y, Pawson T, Rossant J. Early lineage segregation between epiblast and primitive endoderm in mouse blastocysts through the Grb2-MAPK pathway. Dev Cell. 2006 May; 10(5):615- 24. PMID:16678776 (https://www.ncbi.nlm.nih.gov/pubmed/16678776)

Swann K, Campbell K, Yu Y, Saunders C, Lai FA. Use of luciferase chimaera to monitor PLCzeta expression in mouse eggs. Methods Mol Biol. 2009; 518:17-29. doi: 10.1007/978-1-59745-202-1_2. PMID:19085135 (https://www.ncbi.nlm.nih.gov/pubmed/19085135)

Posfai E, Petropoulos S, de Barros FRO, Schell JP, Jurisica I, Sandberg R, Lanner F, Rossant J. Position- and Hippo signaling-dependent plasticity during lineage segregation in the early mouse embryo. Elife. 2017 Feb 22; 6. pii: e22906. doi: 10.7554/eLife.22906. PMID: 28226240 (https://www.ncbi.nlm.nih.gov/pubmed/28226240)

Gu B, Posfai E, Rossant J. Efficient generation of targeted large insertions by microinjection into two-cell-stage mouse embryos. Nature Biotechnology 2018 Aug; 36(7):632-637. doi: 10.1038/nbt.4166. Epub 2018 Jun 11. PMID: 29889212 (https://www.ncbi.nlm.nih.gov/pubmed/29889212)

More Choices:
  1. Standard Glass Capillaries
    Standard Glass Capillaries
    Multiple SKUs
  2. Thin Wall Glass Capillaries
    Thin Wall Glass Capillaries
    Multiple SKUs
  3. Pre-Pulled Glass Pipettes/Pack of 10
    Pre-Pulled Glass Pipettes/Pack of 10
    Multiple SKUs
  4. Pre-Pulled Glass Pipettes, Luer/Pack of 10
    Pre-Pulled Glass Pipettes, Luer/Pack of 10
    Multiple SKUs
  5. WPI Microelectrode Holder for MICRO-ePORE™
    WPI Microelectrode Holder for MICRO-ePORE™

    Please Contact WPI for Pricing

Unpacking Your MICRO-ePORE™ System


Connecting Your MICRO-ePORE™ System

Connecting the MICRO-ePORE™ Electrode Holders

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