title: "Masked" forms of mRNA.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D002499:Centrifugation, Density Gradient; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000378:metabolism*; D007930:Leucine / Q000378:metabolism; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism*; D012617:Sea Urchins; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D012333:RNA, Messenger; D014316:Tritium; D007930:Leucine; D014529:Uridine