Five human genomic DNA clones present in PAC vectors were tested by hybridization for the presence of six sequence-tagged sites designated STS1 through STS6. The results are given in the following table: a plus indicates the presence of the STS, and a minus indicates the absence of the STS.

(a) What is the order of the STS sites on the chromosome?

(b) Draw the contig map defined by these data.

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STS 1 2 3 5 6 A D YAC clone B.