. Author manuscript; available in PMC: 2022 Apr 24.
Published in final edited form as: J Comp Neurol. 1999 Jun 7;408(3):419–436. doi: 10.1002/(sici)1096-9861(19990607)408:3<419::aid-cne8>3.0.co;2-4
This article is a US government work and, as such, is in the public domain in the United States of America.