In the Alignment Panel, the primary structure of the protein is shown as a sequence of one-letter amino acid codes at the top. Also, the segment number is shown above each code. The primary sequence of the ball-and-stick template is shown below the current protein's sequence. The amino acid codes for segment 1 through 38 are the same in the protein and the template. The template has two additional amino acid at the end. When you click on the "play" button (the small triangle) in the Alignment Panel, the protein "threads" to the shape of the template.