silkworm_miRNA.gff is the annotation result for silkworm miRNA. All on one line, for example here (with descriptions): ------ nscaf1108 homsearch miRNA 2463276 2463357 -26.60 - . GenePrediction BGIBMMIRNAA000001 Struct .(..(((((((..((.(((..((((((....))))))..)))...))..))..)))))..)..((((...))))........ Mature 9..25 Homolog rno-miR-138,AGCUGGUGUUGUGAAUC ------ Where: nscaf1108: is the id of the genome sequence. homsearch: is the method miRNA: is the kind of gene. 2463276: is the start of the tRNA gene. 2463357: is the end of the tRNA gene. -26.60: is the energy of miRNA. -: is the strand of gene. BGIBMMIRNAA000001: is the id of the miRNA gene. Struct .(..(((((((..((.(((..((((((....))))))..)))...))..))..)))))..)..((((...))))........: is the structure of miRNA gene. Mature 9..25 Homolog rno-miR-138,AGCUGGUGUUGUGAAUC: is the homology annotation of this miRNA gene.