Now this is the oxygen attached onto this phosphate. And in this particular case, it's the primary oxygen, not the secondary oxygen. Because we have a primary and a secondary, it's the primary attached onto the phosphorus atom of that phosphate group. And just like in this case, we can have an attached between the p and the oxygen of that alcohol. We have the same thing here, except this molecule is now found on this region here. So this is also choline that we have in this particular case.