Members of the Rab protein family are small GTPases of the Ras superfamily that are thought to ensure fidelity in the process of docking and/or fusion of vesicles with their correct acceptor compartment. Han et al. (1996) isolated fetal lung cDNAs encoding a RAB protein that they designated RABL (RAB5-like). The predicted 216-amino acid RABL protein shares 86% identity with RAB5A and RAB5B and contains the conserved GTP-binding site characteristic of RAS proteins. RT-PCR analysis revealed that RABL is expressed ubiquitously. By analysis of cloned segments, Albertsen et al. (1994) determined that the RABL gene, which they called BC1-16, is located in the BRCA1 gene region on chromosome 17q12-q21. Han et al. (1996) refined the map position to 17q21.2 using FISH.
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