A team of Australian scientists has genetically modified human embryonic stem cells to glow red when they develop into premature red blood cells.
The breakthrough is seen as the next step in producing artificial blood for human beings.
Dr Andrew Elefanty at Monash university in Melbourne and his colleagues inserted specific genes that code for colour into the DNA of a manufactured stem cell line.
He says the coloured genes, known as reporters, highlight the emergence of certain cell types.
"what we've said to the stem cells is when you're going to turn on the gene for globin we want you to also turn on a red light,"ABC Science quoted Elefanty as saying.
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