| 11. | TPCK is chosen for the chemical labelling of active histidine in enzyme analysis.
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| 12. | This pocket contains a histidine buried at the bottom where domain 2 attaches.
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| 13. | Two histidine residues from each subunit coordinate the haem.
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| 14. | Histidine kinases usually have an N-terminal superfamily.
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| 15. | The imidazole nitrogen of a histidine side-chain is a common ligand.
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| 16. | S100A8 histidine residues are coloured grey, S100A9 histidine residues are coloured purple.
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| 17. | S100A8 histidine residues are coloured grey, S100A9 histidine residues are coloured purple.
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| 18. | The CHAP domain contains two invariant residues, a cysteine and a histidine.
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| 19. | One of the histidine residues is electrostatically bound to a negatively charged phosphate.
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| 20. | The second, histidine, they will inject.
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