CYCLIC SURFACE CHANGES IN THE NON‐NUCLEATE EGG FRAGMENT OF XENOPUS LAEVIS

Publisher Website
Google Scholar
Abstract
Fertilized uncleaved eggs of X. laevis were divided into nucleate and nonnucleate egg fragments. Both fragments, together with the whole egg of the same batch, were observed by time-lapse cinematography. Two kinds of cyclic surface changes, rounding-up and relaxing movements, and surface contraction waves, accompanied each cleavage in the whole eggs and the nucleate fragments and were also observed in the nonnucleate fragments although they do not cleave. Cleavage intervals of the whole egg and the nucleate fragment were nearly equal but the rounding-up intervals of the nonnucleate fragment were slighty, but definitely, longer than the cleavage intervals of the nucleate fragment and the whole egg.