HPSE and neoplasm: This similarity can also be extended to sLea and HPA: only some HT 29 cells showed a mixed colour of HPA and P-selectin fusion protein staining, whereas most of them bound either HPA or P-selectin fusion protein (Figure 4), indicating that the glycotopes recognised by the selectins and HPA are different and that most – but not all – of the tumour cells express either selectin or HPA-binding sites.