I go to tools and open the sequence of the protein that I am interested in. The minimum number of amino acids in a row that I can select is 2. I am interested in visualizing a selected number of amino acids that are not in linked to one another. Eg. A specific Lys residue in a helical sequence. I have found a work around. I highlight two adjacent residues, and visualize the two of them as sticks. I then select the amino acid I do not wish to highlight together with the amino acid on the other side of the one that I am interested in. I can that way eventually deselect and not highlight the amino acid I am not interested in. There has to be a simpler way. Thanks for your assistance. Arthur G. Szabo Professor Emeritus Chemistry Wilfrid Laurier University.