Has low chemotactic activity for eosinophils. May play a role in inflammation and allergy. Has no chitinase activity. Detected in the cytoplasm of keratinocytes. Detected in stratified squamous epithelium in the junctional region between forestomach and glandular stomach (at protein level). Expression is mainly restricted to stomach. Up-regulated in response to IL4 and IL13 and during the allergic response. Belongs to the glycosyl hydrolase 18 family. Chitinase class II subfamily.