Enables integrin binding activity. Acts upstream of or within several processes, including metanephric glomerulus development; neurogenesis; and visual perception. Located in basement membrane and neuromuscular junction. Part of laminin-3 complex. Is active in synaptic cleft. Is expressed in several structures, including Reichert's membrane; alimentary system; brain; decidua; and liver. Used to study Pierson syndrome and nephrosis. Human ortholog(s) of this gene implicated in Pierson syndrome and nephrotic syndrome type 5. Orthologous to human LAMB2 (laminin subunit beta 2). [provided by Alliance of Genome Resources, Apr 2022]