tokens: In addition , we have found several examples of two other known polymorphic variants ( G6PD Cagliari and G6PD A - ) ; three new polymorphic variants , G6PD Metaponto ( class III ) , G6PD Montalbano ( class III ) , and G6PD Pisticci ( class IV ) ; and two sporadic variants , G6PD Tursi ( class III ) and G6PD Ferrandina ( class II ) .