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The free radical generated from photochemistry comes into play here, entering the enzyme active site and engaging the enzymatic intermediate to enable new chemistry.

ATP is the central energy carrier of the cell which supports numerous molecular processes, while, histidine is the most common amino acid found in the active site of enzymes, and maintains their acid-base chemistry.

The model allowed them to identify a protein that interacts with the DNA as it is being transcribed and guides it to the enzyme's active site.

The drugs work by attaching to a pocket adjacent to the active site, inducing an allosteric conformational change in the protein that prevents it from being activated.

Forest Service stipulates that the observatory must remain an active site for research, astronomy or education — or be dismantled down to its last historic bolt.