PLATE 1 
EXPLANATION OF FIGURES 
Spermatogonia 
1 Early resting spermatogonial nucleus. 
2, 3, and 4 Formation of prophase spermatogonial chromosomes. 
5,6, and 7 Syncytia containing resting nuclei (fig. 5), prophase nuclei (6), 
and mitotic figures (fig. 7). 
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