Lead and the skin.
D000818:Animals; D003306:Coproporphyrins / Q000652:urine; D005243:Feces / Q000032:analysis; D006197:Hair / Q000032:analysis; D006801:Humans; D007221:Industry; D007854:Lead / Q000032:analysis / Q000378:metabolism; D007855:Lead Poisoning / Q000473:pathology* / Q000652:urine; D011166:Porphyrins / Q000652:urine; D011817:Rabbits; D051381:Rats; D012867:Skin / Q000473:pathology*; D013542:Sweat / Q000032:analysis
D003306:Coproporphyrins; D011166:Porphyrins; D007854:Lead