TYROSINE-HYDROXYLASE (TH)-like immunoreactivity was investigated in no
rmal and oestrogenized rat anterior pituitaries in the light of recent
studies showing a TH enzymatic activity in the gland and the presence
of TH mRNA in endocrine cells. Sparse TH positive fibres, probably do
paminergic as assessed by the absence of dopamine-beta-hydroxylase (DB
H) immunoreactivity, were detected in the anterior pituitary, but the
detection of TH immunoreactivity in cells was unsuccessful.