CSPG4 and melanoma: IgG1 antibodies were expressed alongside the control (anti-melanoma recognizing the tumor antigen Chondroitin sulfate proteoglycan 4) anti-CSPG4 IgG1/k and anti-NIP (5-iodo-4-hydroxyl-3-nitrophenacetyl hapten-specific) IgG1/λ (Fig. 7b and Table 1: V region characteristics and original isotypes).