So let's underline that this group here, or let's actually go to this group, this group here, which is our histidine. So this nitrogen, right, can gain or lose an h atom at a PKA of 6.0. Okay, now let's go to tyrosine. For tyrosine, the PKA value is about 10.9. For this one, which is lysine, the PKA value is 10.8. So slightly below that for tyrosine.