The protein at left, thymidine synthase, makes the one of the nucleotides of DNA. It is colored according to how conserved each of its amino acids is, when compared to the 100 most similar sequences known. The most conserved amino acids are a deep red, and the least conserved (most variable) are blue.

Use the checkboxes below to turn off or on the amino acids of each color separately; use the spacefill on/off buttons to display all or none.