″ The fourth color opsin for these animals lies in the ultraviolet. For humans such a protein must be carefully picked among existing ones (or else designed anew) since the human eye naturally blocks UV light. UV-A (320-400 nm) is likely the best candidate as a large part of it reaches the retina and there are animal uv opsins with mean responsivity at around 370 nm. ”
How does this compare to those humans who are naturally tetrachromate? Do they see ultraviolet as well, or something else? And why select something other than what they have which clearly works with human brains and eyes?
″ The fourth color opsin for these animals lies in the ultraviolet. For humans such a protein must be carefully picked among existing ones (or else designed anew) since the human eye naturally blocks UV light. UV-A (320-400 nm) is likely the best candidate as a large part of it reaches the retina and there are animal uv opsins with mean responsivity at around 370 nm. ”
How does this compare to those humans who are naturally tetrachromate? Do they see ultraviolet as well, or something else? And why select something other than what they have which clearly works with human brains and eyes?