 The age of the gene  and its conservation across vertebrate species are key indicators of whether a peptide will be detected in proteomics experiments.
<meaning-changed>  The age of the gene  and its conservation across vertebrate species are key indicators of whether a peptide will be detected in proteomics experiments.
 The age of the gene family and its conservation across vertebrate species are key indicators of whether a peptide will be detected in proteomics experiments.