To dissect the main source of BAMBI in humans, we analyzed public scRNA-Seq data from the Tumor Immune Single-cell Hub 2 (TISCH2) (http://tisch.comp-genomics.org/) and observed the relatively high expression of BAMBI in monocytes/macrophages in patients with melanoma or colorectal cancer (Supplemental Figure 2C). The gene discussed is BAMBI; the disease is melanoma.