WEMBL consists of several plant proteins required for the chloroplast avoidance response under high intensity blue light. This avoidance response consists in the relocation of chloroplasts on the anticlinal side of exposed cells. Acts in association with PMI2 to maintain the velocity of chloroplast photo-relocation movement via the regulation of cp-actin filaments [1]. Thus several member-sequences are described as "myosin heavy chain-like".

1: Two interacting coiled-coil proteins, WEB1 and PMI2, maintain the chloroplast photorelocation movement velocity in Arabidopsis. Kodama Y, Suetsugu N, Kong SG, Wada M; Proc Natl Acad Sci U S A. 2010;107:19591-19596. PMID:20974974