sentences:  By contrast, anoles and geckos each use a single, common structure, although it appears to have evolved independently in the two groups.As in other lizards of the genus "Prasinohaema", the blood of "P. virens" is green, rather than the usual red coloration of most vertebrates.The green blood pigmentation results in a strikingly bright lime-green coloration of muscles, bones, tongue, and mucosal tissue, and is the result of the accumulation of the bile pigment biliverdin in levels that would be toxic in all other vertebrates.