Laminins are a major constituent of all basement membranes. The polymerisation of laminins at the cell surface is mediated by the three short arms of the cross-shaped laminin heterotrimer. The short arms contain repeats of laminin-type epidermal growth factor-like (LE) domains, interspersed with globular domains [1]. This domain consists of a beta-sandwich related to bacterial family 35 carbohydrate binding modules, and more distantly to the L4 domains present in the short arms of laminin alpha and gamma chains [1].

1: Crystallographic analysis of the laminin beta2 short arm reveals how the LF domain is inserted into a regular array of LE domains. Pulido D, Briggs DC, Hua J, Hohenester E; Matrix Biol. 2017;57:204-212. PMID:27425256