Enables growth factor activity; identical protein binding activity; and protein phosphatase binding activity. Involved in several processes, including animal organ regeneration; cellular response to gastrin; and positive regulation of epithelial cell proliferation. Located in several cellular components, including dendrite membrane; neuronal cell body membrane; and zymogen granule. Part of protein-containing complex. Biomarker of colon cancer and myocardial infarction. Human ortholog(s) of this gene implicated in type 1 diabetes mellitus. Orthologous to several human genes including REG1A (regenerating family member 1 alpha). [provided by Alliance of Genome Resources, Apr 2022]