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Subtle differences can be seen between a CBAB6 (CBA mother; blue) and a B6CBA (C57Bl6 mother; yellow). Both are intermediate to the parental shapes (grey), but CBAB6 sperm are wider, and their shape is closer to that of the C57Bl6. (A) Consensus nuclei with the number of analyzed sperm; (B) size measurements; (C) overlay of consensus nuclei; (D) comparison of angle profiles; the tail attachment region is expanded in the inset.
