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“The substrates within each CDR that are frequently seen mutated are defined as “hotspots��. They are described by preferences for purines, rather than pyrimidines, as well as for particular codons, or codon motifs within the sequence. The fact that mutation in a hotspot can create or delete other hotspots indicates a higher order structure to the mutation process than that which is currently observable.
McKay Brown, Mary Stenzel-Poore, Susan Stevens, Sophia K. Kondoleon, James Ng, Hans Peter Bachinger, and Marvin B. Rittenberg. Immunologic memory to phosphocholine keyhole limpet hemocyanin. Journal of Immunology, 148(2):339��346, January 1992.”