YAC contig map of proximal mouse chromosome 12 (MMU12). YAC data shown correspond to the minimal number of YACs required to span the probe path as established using the wprobeorder program. Marker origin is identified in Table 1. Additional information available for markers is displayed as follows: T31, marker placed on mouse RH panel; EUCIB, marker genetically mapped on interspecific mouse backcross panel; WC12.*, marker placed on the physical map of Nusbaum et al. (1999). Map segments (breaks identified by blank vertical lines) are displayed sequentially with respect to their order along the chromosome. This order was deduced from genetically mapped markers within segments and their position on the MMU12 chromosome committee map (D'Eustachio and Riblet 1999).