TY - GEN AU - Stevens,Craig W TI - The evolution of vertebrate opioid receptors SN - 2768-6698 PY - 2009///0407 KW - Animals KW - Evolution, Molecular KW - Gene Duplication KW - Genome, Human KW - Humans KW - Receptors, Opioid KW - genetics KW - Vertebrates N1 - Publication Type: Journal Article; Research Support, N.I.H., Extramural; Review UR - https://doi.org/10.2741/3306 ER -