Examples of hemispheres with asymmetrical number of barrels from three BXD mice. (A) Photomicrograph and outline drawings of left (LH) and right (RH) hemispheres from one BXD83 mouse. Total PMBSF areas are indicated below line drawings. Number of barrels does not significantly affect total PMBSF area. (B-C) Line drawings of PMBSF barrel representations from two additional BXD mice (BXD86, BXD9). Scale 500 μm.