The incorporation of Sdc2, RON, and ABL1 into the receptor complex in tumor cells contrasts with the makeup of the complex in nontumorigenic cells; originally defined in HaCaT cells, Sdc4 immunoprecipitates contain EGFR and α6β4 and α3β1 integrins that the HaCaT cells use for migration on LN332 (7, 13). This evidence concerns the gene SDC4 and neoplasm.