Monocyte-macrophage surface marker expression on developing EBs. Flow cytometric analysis of EBs from hESCs (H1, HES2) and hiPSCs (MSC-iPS1) harvested at the indicated times during hematopoietic differentiation, showing expression patterns of CD18, CD11b, CD115, and CD14, expressed as a percent of CD45⁺ hematopoietic progenitors. Open histograms represent populations stained with the indicated antibodies and shaded histograms represent unstained control samples.