“…These monoclonal antibodies include the one for receptors on HeLa cells for CB1, CB5, and CB6 obtained by Campbell and Cords (5), one for the receptor on HeLa, RD, and monkey kidney cells for the three poliovirus immunotypes obtained by Minor et al (30), one for receptors on HeLa cells for the major group of HRVs found by Colonno et al (5a), and the one reported herein, which has an extended receptor specificity to completely block receptors for CB1, CB3, CB5, E6, and coxsackievirus A21 on HeLa cells and CB1-RD, CB3-RD, and CB5-RD on RD cells. In general these monoclonal antibodies help to confirm the existence of separate receptor families for the different species of picornaviruses, which first were recognized by virus competition experiments (1,3,6,7,14,23,29,32,34).…”