tyrosine hydroxylase ( th ) immunocytochemistry and quantitative light microscopic analysis of neurons in the substantia nigra pars compacta , the ventral tegmental area , and the locus coeruleus of weaver mutant mice at 12 and 15 weeks of age and unaffected controls revealed a decrease in the number of th-positive neurons in the substantia nigra of weaver mice , but no change in cell numbers in the ventral tegmental area and locus coeruleus .
C0175412
substantia nigra pars compacta
C0038590
substantia nigra