<unk> s 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 the spermatozoon than histones, but they must be decompressed before the genetic data can be used for protein synthesis. However, in humans and maybe other primates, 10-15% of the sperm's genome is packaged by histones thought to bind genes that are essential for early embryonic development.<unk>  and<unk> -like (PL) proteins are collectively known as the sperm-specific nuclear basic proteins (SNBPs). The PL proteins are intermediate in structure between<unk>  and Histone H1. The C-terminal domain of PL could be the precursor of vertebrate<unk> .
Protamine
Platelet-rich plasma
Fresh frozen plasma
Aminocaproic acid
Pentoxyverine
Cryoprecipitate
Plasminogen 
Prothrombin complex concentrate