To test this, they stained some skin preparations with fluorescently-labelled antibodies that recognise and bind to opsins and other proteins that interact with them.
In India, betel leaves were popularized by Mogul queens, who discovered that they stained their lips red, the better to attract swains.
We stopped for lunch at Sand Dunes, far from the tourist trail and where flying-fish fritters come with fiery sauce and sodas so vibrant they stained our tongues.
In early August, the variety here ranged from peaches so juicy they stained a T-shirt on the first bite, to blueberries packed carefully in 10-pound cartons to protect their dusty white bloom, not a defect but the sign of a fresh berry, and bushel baskets piled with bright green peppers.
They stained the cells with an antibody to a fetal protein and plucked them out with a tiny needle.
When they stained yeast nuclei with an antibody to Sgs1, the yeast counterpart of the Werner's protein, they found the protein in the nucleolus.
