is_about_grouped_miRNA miRNA_gene_family hsa-let-7a-1 hsa-let-7a-2 hsa-let-7a-3 hsa-let-7b hsa-let-7c hsa-let-7d hsa-let-7e hsa-let-7f-1 hsa-let-7f-2 hsa-mir-98 hsa-let-7g hsa-let-7i let-7 miRBase:MIPF0000002