# Active residues

**URL:** <https://ask.bioexcel.eu/t/active-residues/297>\
**Category:** HADDOCK\
**Created:** [February 10, 2017, 9:42am UTC](https://ask.bioexcel.eu/t/active-residues/297 "2017-02-10T09:42:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![taniadoc](https://avatars.discourse-cdn.com/v4/letter/t/4da419/32.png) [@taniadoc](https://ask.bioexcel.eu/u/taniadoc)\
**Post date:** [February 10, 2017, 9:42am UTC](https://ask.bioexcel.eu/t/active-residues/297/1 "2017-02-10T09:42:51Z")

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Hi ,

Together with some NH2-residues I also listed the last five COOH-residues of the second molecule as active sites. Unfortunately, I’ve realised that I was using a shorter version of the second molecule, so only the first COOH-active residue was present in the PDB and not the other four COOH-residues I’ve listed as well. Haddock run successfully, should I assume that it just ignored the missing ones?

many thanks

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**Author:** ![amjjbonvin](https://dub1.discourse-cdn.com/flex013/user_avatar/ask.bioexcel.eu/amjjbonvin/32/23_2.png) [@amjjbonvin](https://ask.bioexcel.eu/u/amjjbonvin)\
**Post date:** [February 10, 2017, 10:50am UTC](https://ask.bioexcel.eu/t/active-residues/297/2 "2017-02-10T10:50:30Z")

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Indeed - check your models, it must be absent…