add extract_sequence_randomly.pl
add extract_sequence_randomly.pl

DawnEve/bio_scripts,zctea/bio_scripts,shenwei356/bio_scripts,shenwei356/bio_scripts,shenwei356/bio_scripts,zctea/bio_scripts,DawnEve/bio_scripts,zctea/bio_scripts,shenwei356/bio_scripts,DawnEve/bio_scripts,DawnEve/bio_scripts,zctea/bio_scripts,DawnEve/bio_scripts,zctea/bio_scripts