Following is a titration curve for the amino acid histidine. Identify the pK values for the histidine functional groups, or the pI of histidine, and identify the major histidine species at each...

Following is a titration curve for the amino acid histidine. Identify the pK values for the histidine functional groups, or the pI of histidine, and identify the major histidine species at each position by dragging the items in the list to the appropriate labeling box. More than one item can go in a large box. Not all items will be used.