in the cells is now much more accurate than before these sequencing projects were initiated. For example, in an Escherichia coli cell, there are roughly 4300 proteins and almost 3000 of them are enzymes. Mammals have more than ten times the number of proteins and enzymes than there are in E. coli.
Proteins are made up of amino acids. Proteins are big molecules that are too large to pass through the gut wall. They must first be broken down into amino acids. Once inside the body, the amino...