"The estrogen receptor is like a keyhole in a locked door, and estrogen is the key that opens that door and "turns on" growth-promoting effects in the cell. However, among dozens of keys, you might find some that fit into the keyhole but do not work to turn the lock and open the door."
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.