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Evidence is discovered for selective constraint against the occurrence of lysine residues (which likely disrupt prion formation) in S. cerevisiae prion-forming domains as they evolve across Saccharomycetes. These results provide a case study of the absorption of mutational trends by compositionally biased domains, and suggest methodology for assessing selection pressures on the composition of intrinsically disordered regions.The coefficient of variation is often used to illustrate the variability of precipitation. Moreover, the differenc