library_construction_protocol: RNA was isolated using the Qiagen Rneasy Mini Kit. mRNA was isolated from total RNA using the Dynabeads mRNA DIRECT Purification Kit (Invitrogen). mRNA was converted into cDNA using the SuperScript III First-Strand Synthesis SuperMix Kit (Invitrogen). Final cDNA samples were split into 16 separate reactions and amplified using 16 unique Illumina indexing primers and Q5 Hot Start High-Fidelity 2X Master Mix (NEB). Reactions were pooled into a single sample and cleaned using AMPure beads (Beckman Coulter). Library was sequenced on one lane of an Illumina MiSeq.