TY - RPRT TI - Decrease of tolerance development to morphine by 5-hydroxytryptophan and some related drugs. AU - E Contreras AU - L Tamayo AU - L Quijada AU - E Silva PY - 1973 DO - 10.1016/0014-2999(73)90035-6 UR - https://pubmed.ncbi.nlm.nih.gov/4270007/ ID - 4270007 ER -