Replies

Allow me to be the first, apparently, to disabuse you of this notion that you've somehow internalized, that protamines are somehow defined from a list of compounds X, Y, and Z, and things not X, Y, or Z are therefore not protamines. It doesn't work that way, despite how convenient such a definition might be for your purposes here.

Well disabuse yourself of the notion that "minor change" does not constrain the entity under discussion. It does constrain it.

BTW

pro·ta·mine (pr

-m

, -m

n) or pro·ta·min (-m

Any of a group of simple proteins found in fish sperm that are strongly basic, are soluble in water, are not coagulated by heat, and yield chiefly arginine upon hydrolysis. In purified form, they are used in a long-acting formulation of insulin and to neutralize the anticoagulant effects of heparin.

DEFINITION:

Any of a class of basic proteins of low molecular weight, occurring in combination with nucleic acids in the sperm of salmon and certain other fish and having the property of neutralizing heparin.