RNA-seq of Medicago truncatula RNA-seq of Medicago truncatula mycorrhizal roots (21 days)  biological replicate 1 RNA-seq of Medicago truncatula mycorrhizal roots (21 days)  biological replicate 2 RNA-seq of Medicago truncatula mycorrhizal roots (21 days)  biological replicate 3  roots (21 days)  biological replicate 3