title: Transcription of repetitive and unique DNA nucleotide sequences in pigeon erythroid cells with different degrees of specialization.
abstract: HnRNA fractions with sedimentation coefficients greater than 45 S isolated from pigeon bone marrow as well as from the immature and mature erythroid cells of periferal blood were hybridised with a large excess of DNA fractionated on the basis of renaturation kinetics. 58-62% of the input RNAs were recovered as RNAase-resistant hybrids. About 1/3 (20%) of bone marrow greater than 45 S RNA found in the hybrids was hybridised with the repetitive and baout 2/3 (40%) with the unique DNA sequences. In addition, a considerably smaller portion of greater than 45 S RNA from the "reticulocytes" (13%) and "erythrocytes" (approximately 6%) was hybridised with the repetitive DNA.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002454:Cell Differentiation; D004247:DNA / Q000378:metabolism*; D004900:Erythroblasts / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D009694:Nucleic Acid Precursors / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D012156:Reticulocytes / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D009694:Nucleic Acid Precursors; D012313:RNA; D004247:DNA