"NADPH is like a rechargeable battery."
"NADPH is like an electron bus, shuttling electrons to the Calvin Cycle."
"NADPH is like NADH but it has a phosphate attached to it. Enzymes that use NADPH cannot use NADH and vice versa. "
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.