Statistics of acetylated proteins and sites information in training dataset and independent test set among four species, i.e. <i>H</i>. <i>sapiens</i>, <i>M</i>. <i>musculus</i>, <i>E</i>. <i>coli</i>, and <i>S</i>. <i>typhimurium</i>.

(The non-acetylated sites were selected at the ratio of 1:1 compared to acetylated sites.) Additionally, the statistics data of S. cerevisiae and R. norvegicus was marked with asterisk (*) which means that we removed them from our analysis because these two species had too few samples for training model.