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The gene encoding the human homologue of the guinea pig uterine bombesm receptor [( 1992) Eur. J. Biochem. 208,405] was isolated from a genomic lambda library by the PCR/homology screening approach. The gene spans more than 4 kb and consists of 3 exons and 2 introns. The deduced amino acid sequence shows about 86% identity to that of guinea pig bombesin receptor. This subtype of bombesin receptor is expressed in the pregnant uterus and in two human tumour cell lines, T47D (ductal breast carcinoma) and A431 (epidermal carcinoma). PCR analysis of genomic DNA from human-mouse cell hybrids allows the cloned gene to be localized to the region q26q28 on chromosome X.
The minor form of vallne tBNA from baker's yeaat - tRNA\(^{Val}_{2b}\) - purified by column chromatography was completely digesteft with guanylo-BNase and pancreatic ENase. The products of these digestions were separated by a combination of thin-layer chromatography on cellulose and high voltage electrophoresis on DEAE-paper and then identified. The halves of tRNA Val 2b were prepared by partial digestion with pancreatic Mass and their complete guanylo-BNase and pancreatic ENase, digests were analysed. Basing on the obtained data the primary structure of baker1s yeast tRNA\(^{Val}_{2b}\) was reconstructed.