The function of PEX11B (peroxisomal biogenesis factor 11 beta, ENSG00000131779) is as follows. Involved in peroxisomal proliferation (PubMed:9792670). May regulate peroxisome division by recruiting the dynamin-related GTPase DNM1L to the peroxisomal membrane (PubMed:12618434). Promotes membrane protrusion and elongation on the peroxisomal surface (PubMed:20826455). {ECO:0000269|PubMed:12618434, ECO:0000269|PubMed:20826455, ECO:0000269|PubMed:9792670}.