BMPR1A and neoplasm: Different from other studies involving single-cell transcriptome profiling of human biopsy samples5–7, we could not computationally pinpoint the tumor cells by global copy-number variation (not present in our data), nor by identifying β-catenin and Bmpr1a mutations (not detectable) or EYFP-positive cells (mRNA transcripts not sufficiently captured by our sequencing method).