Immunofluorescent localization of insulin-like material in the median neurosecretory cells of the blowfly, Calliphora vomitoria (Diptera).

Immunocytochemical staining has shown that the median neurosecretory cells (MNC) of the brain of the blowfly, Calliphora vomitoria, contain an insulin-like material which cross reacts with antibodies to bovine insulin. There are 24-26 paraldehyde fuchsin-positive MNC of which only 6-8 show the specific insulin-like immunoreactivity.