The glass capillary tubing commonly used for microinjection used should be thin walled, borosilicate glass without a fiber. (a good example is supplied by Clark Electromedical Instruments with the following properties:)
OUTSIDE DIAMETER: 1.0 mm
INSIDE DIAMETER: 0.78 mm
LENGTH: 150 mm
GC 100T to 15 (= 15 cm)
GC 100T to 10 (= 10 cm)
Note that micro-injection pipettes should have an internal diameter only marginally larger than the stem cells (18 to 20 μm) and a sharp point that allows the needle to penetrate cleanly in the blastocoel cavity.
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