CST5 (Cystatin D) is a Protein Coding gene. Diseases associated with CST5 include Central Corneal Ulcer. Among its related pathways are Endochondral Ossification and Salivary secretion. CST5 is located in the cystatin locus and encodes a protein found in saliva and tears. The encoded protein may play a protective role against proteinases present in the oral cavity.