Enables several functions, including hormone binding activity; metal ion binding activity; and peptide binding activity. Involved in several processes, including cellular response to lithium ion; response to estradiol; and response to testosterone. Located in several cellular components, including acrosomal vesicle; endoplasmic reticulum; and perinuclear region of cytoplasm. Part of protein-containing complex. Biomarker of vitamin B12 deficiency. Human ortholog(s) of this gene implicated in essential thrombocythemia; myelofibrosis; pancreatic ductal adenocarcinoma; sideroblastic anemia; and thrombocytosis. Orthologous to human CALR (calreticulin). [provided by Alliance of Genome Resources, Apr 2022]