RPSA and colorectal carcinoma: However, a recent study from our group using cell fractionation of CRC cells pointed out that the 67 kDa immunoreactive protein, corresponding to the mature 67LR, was present in the soluble protein fraction and identified as another laminin receptor displaying immune cross-reactivity with RPSA, the β-galactosidase-related 67 kDa elastin-binding protein (67EBP) [27].