Comparison between the constitutive attachment profiles of Sc-1/Ci-1 cells and various neoplastic human T and B leukocytes adhering to intact fibronectin, the 110-kD polypeptide, or the 38-kD fragment. Integrin expression as determined by FACS was as follows: Karpas, HUT78 and HUT102 5β1^high/4β1^low; Ramos 4β1^high; and Jurkat 5β1^high/4β1^high/4/β7^high. Each substrate molecule was coated at a concentration of 10 μg/mL (not in molar equivalents). In all cases, binding to the control BSA substrates was less than 10%.