Comments: CyGel Sustain was our miracle solution to perform the extremely technically challenging intraocular injections in zebrafish larvae at 2 days post fertilization, in a 100% accurate and reproducible way. Thanks to CyGel Sustain we could immobilise these larvae (no more than 2 mm long) and carry out the intraocular injections into their eyes (no more than 50 microns diameter) under the dissecting microscope. After injection, CyGel was reverted to liquid and larvae recovered with no damage (Reference(s): Alvarez, Y., et al. PLoS One 4.11 (2009): e7867.) We have used CyGel Sustain since then for different protocols where safe and reversible immobilization of the small larvae is needed with excellent results. Biostatus outstanding support and contribution for the refinement of our protocols and overcome of technical difficulties, is not easy to find among the post-sale service of other companies.