de novo gene birth
... that de novo gene birth was once thought to be impossible but has now been observed in every species that has been systematically examined?
... that <b id="mwA3c"><a href="./De_novo_gene_birth" id="mwA3g" rel="mw:WikiLink" title="De novo gene birth"><i id="mwA3k">de novo</i> gene birth</a></b> was once thought to be impossible but has now been observed in every species that has been systematically examined?