Free aldehydic groups in collagen and other tissue components.
D000447:Aldehydes / Q000032:analysis*; D000818:Animals; D001001:Anura; D003094:Collagen / Q000032:analysis*; D006801:Humans; D051381:Rats; D012867:Skin / Q000032:analysis*
D000447:Aldehydes; D003094:Collagen