Words similar to pre-existed

Example sentences for: pre-existed

How can you use “pre-existed” in a sentence? Here are some example sentences to help you improve your vocabulary:

Statistical methods were used to study the exon sequences flanking 49 different spliceosomal intron insertion sites in Euascomycetes rRNA and show that the introns interrupt the G - intron - G (hereafter, the intron position is shown with -) proto-splice site that pre-existed in the coding region.