the cdna and gene of the beta 2-adrenergic receptor possess the unusual feature of having a second upstream atg ( -101 base pairs ) and a 19-codon open reading frame 5 ' to the initiator methionine codon of the receptor ( kobilka , b. k. , dixon , r. a. f. , frielle , t. , dohlman , h. g. , bolanowski , m. , sigal , i. s. , yang-feng , t. l. , francke , u. , caron , m. g. , and lefkowitz , r. j . ( 1987 ) proc . natl . acad . sci . u.s.a. 84 , 46-50 ) .
C0009221
codon
C0242610
initiator