Sperm protein
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- A tyrosine-phosphorylated 55-kilodalton motility-associated bovine sperm protein is regulated by cyclic adenosine 3',5'-monophosphates and calcium.
- P34H sperm protein is preferentially expressed by the human corpus epididymidis.
- The abalone is one of the only organisms where one sperm protein is known to bind one egg protein (a cognate pair of gamete recognition proteins).
- Pulse-labeling studies show that this major sperm protein is first synthesized in the proximal arm of the male gonad beginning at 39-42 hr after hatching at 20C.
- Both spermatogenesis and 15K synthesis continue for the life of the male while in the protandrous hermaphrodite the major sperm protein is synthesized only during the fourth larval stage.
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