How many variations of typical proteins exist for humans.
For example, hemoglobin, has 146 aminoacids (438 base paris needed to code).
Now how many variants of this protein is allowed for it to still function,
in humans for example. Ie how many aminoacids can be different, and the
protein can be still called a hemoglobin protein.
Other examples I am interested in is proteins needed for the brain. How many
proteins and how large is a typical protein needed for a brain to function.
What type of variation is allowed for a typical protein of this function.
