add slice to feature so we can get seq_region_start and seq_region_end
add slice to feature so we can get seq_region_start and seq_region_end

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-draw,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode