Abstract
Yolk platelets from blastulae and gastrulae of Xenopus laevis were isolated by a standardized procedure and examined by electron microscopy for evidence of stage-dependent changes of structure. Compared to those from blastulae, gastrula platelets frequently lost the superficial layer during isolation, indicating its increased lability. In addition, platelet dimensions were compared for different stages in situ by light microscopy, and gastrula platelets near the animal pole were found to be 10–20% smaller along both elliptical axes relative to blastula platelets. It is suggested these alterations represent early steps in the preparation of yolk platelets for breakdown.
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