c("cell type: H1", "differentiation time: 0 days", "differentiation stage: embryonic stem cells")
c("cell type: H1", "differentiation time: 2 days", "differentiation stage: mesoderm committed cells")
c("cell type: H1", "differentiation time: 4 days", "differentiation stage: early vascular progenitor cells")
c("cell type: H1", "differentiation time: 8 days", "differentiation stage: late vascular progenitor cells")
c("cell type: H1", "differentiation time: Fully differentiated Endothelial cells", "differentiation stage: endothelial cells")
c("cell type: HUVEC", "differentiation time: 0 days", "differentiation stage: Human umbilical vein endothelial cells")