My book (Snustard and Simmons) mentions that TATA box is present on the non-coding DNA strand but that was for the promoter of mouse thymidine kinase gene.

I have tried to find out more information and stumbled upon these in wikipedia articles which actually said something else:

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> The TATA box can be an AT-rich sequence "located at a fixed distance upstream of the **transcription start site**. (from a paper "The RNA Polymerase II Core Promoter'')
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Then (from a book: *Understanding bioinformatics*),

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> The Transcription start site is the location where transcription starts at the 5'-end of a gene sequence.
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So my question is, on which strand is TATA box actually (or generally) present?