I thought the intersection would be “pasta.”
Here’s a cool sciencey/artsy pic of an embryonic mouse heart.
It’s blue because a small piece of DNA called an enhancer was attached to a [gene] (https://en.wikipedia.org/wiki/Lac_operon) that makes a protein that converts a colorless substrate into a blue one. It’s only blue in some areas because the enhancer is a switch that only gets activated when the right stuff (technical term) is present, and that stuff is only present in those regions. This sort of [reporter assay] (https://en.wikipedia.org/wiki/Reporter_gene) is a way to determine where or when an enhancer is active.
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