I am working on a project where i need to find conserved regions in an insect genome which i can skip. I recently came across a paper which has used phastcon elements from Drosophila for the same. The methods just mentions - "excluding conserved non-coding and 100 bp flanking regions by blasting against UCSC phastCons elements (phastcons score >0.8, size >50 bp) in the 27 way alignment for Drosophila melanogaster". I have been trying to figure this out for more than a month without any success. I would be extremely grateful if anyone could guide me to appropriate resource or steps to understand this. Please help!!