can't read?
Collagen is classified into a number of structurally and genetically distinct types. We use the nomenclature proposed by Bornstein and Traub.
C 3249 (OTTO) Collagen ex. marine fish, 95% Cas no 9007-34-5 - used as cell culture substratum, adhesion. It is also used as an attachment factor for primary cultures of epithelioid cells.