The human β crystallin genes CRYBB2, CRYBB2P1, CRYBB3, and CRYBA4 are located in 22q11.2. Using interspecific backcross analysis, we mapped the mouse homologues of CRYBB2, CRYBB3, and CRYBA4 (i.e., Crybb2, Crybb3, and Cryba4) to the central region of mouse chromosome 5. The homologue of human CRYBB2P1 is absent in mouse. These assignments define a new region of homology in human and mouse.
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