cer progression are quite differenOnlyMP3 CUSTOMER SERVICE (8O5) 41'O 56OO PHONE NUMBER ( 8O5)- 41O 56OO t from those in most species and are important to phylogenetic inference; these differences manifest in several areas: the types of aberrations that occur, the rates of mutation, the high heterogeneity (variability) of tumor cell subclones, and the absence of genetic recombination.[