This repository contains metadata and single-cell data used to generate figures in the manuscript entitled: "Post-infusion Treg-like CAR T cells identify patients resistant to CD19-CAR therapy". Included here: CSV files containing patient cohort metadata, summary statistics and quantitative PCR results; FCS files for flow and mass cytometry data; processed Seurat object for single-cell sequencing data. Raw single-cell sequencing data, cellranger alignment results, and metadata are available through the Gene Expression Omnibus (https://www.ncbi.nlm.nih.gov/geo; GEO accession number: GSE168940). With questions, please reach out to Zinaida Good (zinaida@stanford.edu) or Crystal L. Mackall (cmackall@stanford.edu).