Fig. 9. D2O-induced membrane expansion. (A) Embryos at 75 minutes post
fertilization, prior to application of D2O. Asterisks indicate
embryos lacking vitelline envelopes. (B) Following 10 minutes incubation in
60% D2O, devitellinated embryos increase their surface area and
spread across the substrate. (C) Side view, obtained by recording down through
a 45° prism in a culture dish. Frames are
3 minutes apart.