4auc is a 2 chain structure with sequence from Actinomyces and Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[CHYM_BOVIN] Chymosin is synthesized in the mucosa of the abomasum (fourth stomach) of young (unweaned) ruminants. The enzyme hydrolyzes casein to paracasein.