Assertion: scrotum's part | /r/CapableOf | form middle piece
Facets:
Source sentences:
text: The nuclear portion of the spermatid, which is partly imbedded in the supporting cell, is differentiated to form the head of the spermatozoön, while part of the cell protoplasm forms the middle piece and the tail is produced by an outgrowth from the double centriole of the cell.