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I'm talking about CRISPR system. I know the crRNA is transcribed from the palindromic repeat and the "spacer" but I don't know where the tracrRNA comes from.

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closed as off-topic by anongoodnurse, David, Bryan Krause, WYSIWYG Sep 25 '17 at 7:57

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Usually the tracrRNA is a part of the CRISPR locus and is encoded in the the vicinity of the CRISPR array (e.g. upstream or downstream of the cas genes or the array).

http://www.genome-engineering.org/crispr/wp-content/uploads/2013/01/crispr_processing1.jpg

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