| In this paper the chromosomal localization of the human skeletal muscle genes Troponin 1 slow twitch ( TNNI 1 ) , Troponin 1 fast twitch ( TNNI 2 ) , and Troponin C fast ( TNNC 2 ) and the refinement of the position for alpha Tropomyosin ( TPM 1 ) and beta Tropomyosin ( TPM 2 ) are reported . ^^^ By radiation hybrid mapping , TPM 1 was assigned to chromosome 15q22 . 1 , TPM 2 to chromosome 9p13 . 2 p13 . 1 , TNNI 1 to chromosome 1q31 . 3 , TNNI 2 to chromosome 11p15 . 5 , and TNNC 2 to chromosome 20q12 q13 . 11 . ^^^ |