Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Photomicrographs illustrating representative cholera toxin β subunit (Ctβ) injection sites in the rostromedial tegmental nucleus (RMTg in A and B), ventral tegmental area (VTA in C) and lateral habenula (LHb in D). Outlines shown in the inset in B reflect the dense core and less dense periphery of the injection in relation to immunoreactivity against the μ-opioid receptor. See list for additional abbreviations. Scale bar: 1 mm.
