Does your Biolaminin 332 product contain the LG4 and LG5 domains of the alpha chain?

The LN332 trimeric protein has ~628 kDa total molecular weight (non-reducing SDS-PAGE) and is represented in three individual bands (~367 kDa, 130 kDa, 131 kDa) in reducing SDS-PAGE. We can only be sure that full-length DNA was transfected but since the protein is naturally expressed, we can not be sure whether these two domains are cleaved away or not during protein maturation. Our Biolaminin 332 supports better cell attachment and growth and is thus proved functional.