Western blots of cell line lysates indicated that each of the four mAbs bound to a number of different native CD44 isoforms, presumably by binding to the same unglycosylated amino acid sequences of CD44, suggesting that the CED1 sequence glycosylated in the recombinant HEK293 peptide was not glycosylated in the native CD44 isoforms identified by western blot analysis of lysates of all three cancer cell lines. Here, CD44 is linked to cancer.