Enables integrin binding activity. Acts upstream of or within cellular response to interleukin-7. Located in endoplasmic reticulum and external side of plasma membrane. Part of endoplasmic reticulum chaperone complex. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; heart; and sensory organ. Human ortholog(s) of this gene implicated in Cole-Carpenter syndrome. Orthologous to human P4HB (prolyl 4-hydroxylase subunit beta). [provided by Alliance of Genome Resources, Apr 2022]