The 87A7 locus contains the two divergently transcribed hsp70 genes and the scs and scs! elements. The only transcript found previously in the locus outside the domain bordered by the scs and scs! is shown as a double-ended white arrow (the scheme is an adaptation from Refs 2, 3). A current view on the structure of scs and scs! is shown in close-up. The location of the DNase I hypersensitive sites flanking a resistant core are shown by the HS boxes, drawn to scale. The arrows below the scs and scs! bars show the start and direction of the transcription of the respective genes. The boxes mark the protein coding regions and the broken lines indicate that gene sequences continue beyond the scs and scs! regions. Multiple ESTs mapped their start points within the scs HS. However, only one is shown for simplicity.

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