PMID-sentid Pub_year Sent_text compound_name comp_offset prot_official_name organism prot_offset 5131730-4 1971 The incorporation of l-[4,5-(3)H]-leucine into vitellogenin in vivo and in vitro was observed 12-24h after hormone treatment and increased progressively up to 21 days after treatment. l-[4,5-(3)h]-leucine 21-41 a1-a Xenopus laevis 47-59