"A neutral mutation is like a missense mutation except that the amino acid change does not affect the function of the protein. A silent mutation is like a neutral mutation except the codon change does not result in an amino acid change. Nonsense mutations replace a codon specifying an amino acid in protein with UAG, UGA, ..."
"We can also ignore the neutral mutations, for another reason: not because they are rare but because they are irrelevant. A neutral mutation is like a 'mistake' that does not alter the message. A neutral mistake could be something like a spelling variant, as if the speaker imagines the word as TYGER and the receiver imagines ..."
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.