Sources: Interface [via Arvix], Arizona State Univ.
quote: If we attempt to calculate the probability of an average-sized protein consisting of 400 amino acids being selected only from left-handed amino acids, we come up with a probability of 1 in 2^400, or 10^120. Just for a comparison, the number of electrons in the universe is estimated at 10^79, which although vast, is a much smaller number. 1 divided by a number so vast, is effectively ZERO. And that's just for 1 single protein not thousands and ignoring all the other complex devices that are needed as well.