Comparison of MC252-relevant nonessential metal concentrations in whales from the Gulf of Mexico. Data represented as mean ± standard deviation in units of μg/g tissue. Four nonessential metals found in MC252 oil were observed at elevated concentrations in these whales: Al (panel A), Cr (panel B), Ni (panel C), Pb (panel D), As (panel E), Ba (panel F), and V (panel G).