CORTICAL GRANULES PERSISTING IN GERM CELLS OF XENOPUS LAEVIS AFTER THE CLEAVAGE STAGES

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Abstract
Cortical granules were demonstrated in 2 successive epon sections (0.7 .mu.m thick) stained with PAS [periodic acid-Schiff] reagent and the triple staining method, respectively, to persist beyond the cleavage stages of development to the tadpole stages in X. laevis. They were also examined by EM. The granules, similar cytochemically and ultrastructurally to the cortical granules of unfertilized eggs, were observed in germ cells, pPGC [presumpture primordial germ cell], PGC [primordial germ cell] and in somatic cells at all stages. An ultrastructural similarity between the granules in the PGC at the tadpole stages and chromatoid body was discussed.