Trimeresurvus flavoviridis venom gland phospholipase A(2) (PLA(2)) genes pgPLA 1a and pgPLA 2a encode Asp-49-PLA(2) and genes pgPLA 1b and pgPLA 2b encode an isozyme of Asp-49-PLA(2). Polymorphisms were found in pairs of pgPLA 1a and pgPLA 2a and of pgPLA 1b and pgPLA 2b for individuals of T. flavoviridis. The occurrence of both homozygotes and heterozygotes was demonstrated.