CD44ex10 transfectants exhibit a subtle increase in homotypic aggregation in vitro. Two independently derived representative CD44ex10–containing Namalwa transfectants (CD44ex10_{I and II}) and additional representative CD44H, CD44ex7-14, CD44ex10-14, and vector-only transfectants are shown. The directly spliced CD44ex10–containing Namalwa transfectants exhibited a subtle increase in homotypic aggregation that was not apparent in other CD44 or vector-only transfectants.