I am trying to join the two models attached to this sequence.

I have used the sequence selection code in atom specifier: #1:559.a@C #0:2.a@N

Where model #0 is YFP and #1 is PcPs.

When I go to join models, the Apply button is not accessible.

Can you indicate if I am doing something incorrect in the selection of the C and N atoms?

Thank you for your time.

Kyle