The 3' Region of the ZPA Regulatory Sequence (ZRS) is required for activity and contains a critical E-box
Kathryn F. Ball, Stephen Manu, Abbie K. Underhill…·Kerby C. Oberg
The paper identifies the 3' E-box in the ZRS as critical for enhancer activity and shows that Hoxd13 sites localize activity to the ZPA.