Gating functions in protein networks

[neo ancient]

Lord Snooty <bonzo at dog.com> wrote in
news:pgpmoose.200307160006.21787 at net.bio.net: 

> It seems clear that a Boolean AND function occurs in nature. Also, it
> is clear that, since both inhibition and excitation of pathways
> exists, we can have a NOT gate equivalent. But does an OR gate exist
> in natural protein pathways? An XOR gate?
> 
> -Andrew
> 
> 

you can make an OR gate out of AND and NOT gates.

! (!A & !B) == A | B

the XOR gate is also equivalent

(A | B) & !(A & B) == A ^ B

Jez.