we analyzed four brain regions ( frontal cortex , caudate nucleus , substantia nigra , and cerebellum ) in 36 human brains for concentrations of 24 metals ( ag , al , as , b , be , ca , cd , co , cr , cu , fe , k , pb , mg , mn , mo , na , ni , p , se , ti , v , w , zn ) .
C0038590
substantia nigra
C0006104
brains