While the existence of a "b" isoform of fibroblast growth factor receptor 1 is well established and its biochemical and functional properties have been extensively characterized (e.g., Mohammadi et al. 2005; Zhang et al. 2006), its amino acid sequence is not represented in reference protein sequence databases, except as the 47-residue polypeptide (deposited in GenBank as accession AAB19502) first used by Johnson et al. (1991) to distinguish the "b" and "c" isoforms of the receptor.
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