Text, symbols, and arrows of multiple colors and sizes can be added to the Chimera display using the 2D Labels tool or the command 2dlabels. These annotations are drawn “in the plane of the screen” in front of any displayed objects and do not move when the objects are moved. 2D labels and arrows are included in saved images and movies, and can be faded in or out over a specified number of frames.

Mutations that inactivate the tumor suppressor p53 are found in over 50% of human cancers, and most of the cancer-associated mutations are within its DNA-binding domain. The image shows a tetramer of the p53 DNA-binding domain complexed with DNA (Protein Data Bank entry 2ac0). The tetramer subunits are shown as light blue, green, orange, and yellow ribbons, with red spheres marking several major "hot spots" of mutation. The DNA is shown in purple and blue. (More samples...)