ABSTRACT
In the foregoing paper, Ishizaka (1958) succeeded in demonstrating the presence of a pair of ring-zones in the cortex of sea-urchin eggs which remain absolutely stationary with reference to the co-ordinates outside the egg through successive changes of the form of dividing ova. The purpose of the present paper is to see whether or not a similar situation exists in the case of cells cleaving in a heart shape ; i.e. in cells in which the cleavage furrow of one side appears earlier than that of the opposite side.
Copyright © 1958 The Company of Biologists Ltd.
1958
You do not currently have access to this content.