TY - JOUR T1 - THE <em>IN VIVO</em> LIBERATION OF MORPHINE FROM CODEINE IN MAN JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther SP - 142 LP - 146 VL - 111 IS - 2 AU - Gilbert J. Mannering AU - Arthur C. Dixon AU - Eugene M. Baker III AU - Taiichi Asami Y1 - 1954/06/01 UR - http://jpet.aspetjournals.org/content/111/2/142.abstract N2 - Each of three human subjects was fed 130 mgm. of codeine sulfate. Urine was collected for twenty-four hours and examined for the presence of morphine. A crystalline material was isolated and identified as morphine. ER -