Location of Post Gallery Output Syntax

  • I’m currently displaying all uploaded images in a single post as a gallery at the bottom of the post.

    I’m trying to add a lightbox solution to the gallery of images but I need to add a “rel=XXX” to the anchor tags being generated for each thumbnail. However, I can’t seem to find the location in the WP core files where the anchor tag would be generated.

    Any help?

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