wong-staal , science ( washington , d. c. 225 , 421-424 ( 1984 ) ; k. shimotono , w. wachsman , y. takahashi , d. w. golde , m. miwa , t. sigimura , and i. s. y. chen , proc . natl . acad . sci . usa 81 , 6657-6661 ( 1984 ) ) that a px protein with a molecular weight of at least 38,000 could be synthesized .
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