- Happy #FluorescenceFriday. This beautiful video shows slice by slice section of a zebrafish embryo's head. The embryo is almost completely transparent, proving that zebrafish is an amazing model system for microscopy. Brightfield, red = actin, blue = DAPI 📹: Postdoc Matyas BL (@Mongera lab, UCL)Nov 21, 2025 17:34