"My boyfriend and I wanted tattoos that looked good on their own but had significance when they were joined... I saw a picture of a cell during meiosis, and bingo!". Hopefully they don't drift apart.
I liked the electrocardiograms but think they should be on his chest and not his arms. There were constellations and a lot of physics and math formulas. One had the Y combinator on his arm and another the periodic table, but I think I liked this Einstein v. Newton:
There were lots of chemical structures. A student with celiac disease has the gluten protein that she cannot digest on her leg; a food scientist had capsaicin on her hip; another had her favorite neurotransmitter, serotonin; and a weight lifter had testosterone on his arm. But this biochemist really earned the right to her tattoo. ""Here is a picture of my science tattoo, which is a stylized structure of glycolipid A, the preformed glycolipid membrane anchor precursor I discovered as a graduate student some 20 years ago."
No I have no plans to get one myself.