下载地址:https://www.bx.psu.edu/miller_lab/dist/blastz-2004-12-27.deprecated.tar.gz
wget http://hgdownload.soe.ucsc.edu/goldenPath/hg38/chromosomes/chr4.fa.gz -O hg38.chr4.fa.gz
wget http://hgdownload.soe.ucsc.edu/goldenPath/galGal3/chromosomes/chr4.fa.gz -O galGal3. chr4.fa.gz