The isolation and sequencing analysis of AIS clot RNA is described in detail in a previous paper.10 (link) In brief, clot RNA was isolated via a modified magnetic bead capture protocol for the PerkinElmer Chemagic 360, and eluted into a final volume of 140 uL. Before library preparation, RNA concentration was remeasured via Qbit Assay (Invitrogen, Carlsbad, CA) with a TBS-380 Fluorometer (Promega, Madison, WI) and the quality of the RNA was measured on an Agilent 2400 Tape Station (Agilent, Las Vegas, NV). RNA samples that were not completely degraded on inspection of the electrophoresis gel, we subjected to library preparation via the Illumina TruSeq RNA Library Preparation Kit (Illumina, San Diego, CA). RNA libraries were subjected to 100-cycle, paired-end sequencing on the NovaSeq6000 system (Illumina, San Diego, CA, USA) and analyzed as previously described. Aggregate quality control data (i.e. alignment statistics and feature assignment statistics) were summarized in MultiQC.