Structural superimpositions and sequence signatures for rhesus DH3-15–encoded V2 apex antibody classes. (a) Structural and sequence definition of the RHA1 reproducible antibody class. (b–h) Unique structural and sequence definitions of the 42056-a, 44715-a, 41328-a, V033-a, V031-a, 40691-a, and 6561-a antibody classes. In the sequence signatures, “x” represents any amino acid, while the numbers indicate the Kabat positions of the respective residues.