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Many mutations affecting mouse development have been mapped to the t-complex of mouse chromosome 17. We have obtained 17 cosmid clones as molecular markers for this region by screening a hamster-mouse chromosome 17 and 18 cell hybrid cosmid library with mouse-specific repetitive elements and mapping positive clones via t-haplotype vs. C3H restriction fragment length polymorphism (RFLP) analysis. Twelve of the clones mapping distal to Leh66B in t-haplotypes are described here. Using standard RFLP analysis or simple sequence length polymorphism between t-haplotypes, exceptional partial t-haplotypes and nested sets of inter-t-haplotype recombinants, five cosmids have been mapped in or around In(17)3 and seven in the most distal inversion In17(4). More precise mapping of four of the cosmids from In(17)4 shows that they will be useful in the molecular identification of some of the recessive lethals mapped to the t-complex: two cosmids map between H-2K and Crya-1, setting a distal limit in t-haplotypes for the position of the tw5 lethal, one is inseparable from the tw12 lethal, and one maps distal to tf near the t0(t6) lethal and cld.

New molecular markers for the distal end of the t-complex and their relationships to mutations affecting mouse development.