TY - RPRT TI - Kappa opioid receptor activity modulates memory for peck-avoidance training in the 2-day-old chick. AU - P J Colombo AU - J L Martinez AU - E L Bennett AU - M R Rosenzweig PY - 1992 DO - 10.1007/bf02245314 UR - https://pubmed.ncbi.nlm.nih.gov/1357708/ ID - 1357708 ER -