Simpler in composition than globulin or albumin

• Rich in arginine
• Counteracts the anticoagulant effect of heparin
• A simple protein found in fish sperm

Wikipedia Word definitions in Wikipedia
Protamines are small, arginine -rich, nuclear proteins that replace histones late in the haploid phase of spermatogenesis and are believed essential for sperm head condensation and DNA stabilization. They may allow for denser packaging of DNA in spermatozoon ...

WordNet Word definitions in WordNet
n. a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin

Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) any of a class of proteins, rich in arginine, found in the sperm of fish; used medicinally to control the action of insulin