I have predicted novel miRNA from insect small RNA sequences. What I know the criteria to filter novel miRNAs are significant randfold p-value (labeled as 'yes'), miRDeep2 score >=4 and mature read count >10. From the pdf files generated by miRDeep2, scores for secondary structure is provided where we get MFE. what should be the cutoff for MFE to report novel miRNA.