Recognize rat C-peptide I and II, mouse C-peptide I. Not react with rat proinsulin. Best pairs for immunodetection (coating - conjugate): of rat C-peptides I and II - CC34 - CII-11; for rat C-peptide I only - CC34 - 6H1, CC34 - CI-0; for rat C-peptide II only - CC34 - CII-106, CC34 - CII-138. Can be used for separate or consistent detection of rat C-peptide isoforms (rat C-peptide I and/or rat C-peptide II) in biological samples.