[i000]

To give a concrete examples

1. The HOXD gene cluster adopts a mutually exclusive conformation. IF it "folds" to the left if results in the formation of digit bones ELIF it folds to the right of arm bones ELSE no bones etc. (very very roughly speaking): https://www.science.org/doi/10.1126/science.1234167

2. Another example are olefactory receptors, each olefactory sensory neuron (the cell that "smells") chooses to activate one out of a long array of possible receptors each specific to some smells. So somehow, somewhere a XOR logical operation is "computed" to "pick" https://europepmc.org/article/pmc/4882762