I have a naive question - given the following pdb file: ATOM 1 CA ALA 0 1.125 1.534 0.000 0.00 0.00 0 C ATOM 2 C ALA 0 0.000 0.514 0.000 0.00 0.00 0 C ATOM 3 O ALA 0 -1.173 0.853 0.000 0.00 0.00 0 O ATOM 4 N ALA 1 0.394 -0.796 0.000 0.00 0.00 0 N ATOM 5 CA ALA 1 -0.546 -1.905 0.000 0.00 0.00 0 C ATOM 6 H1 ALA 1 1.017 2.171 0.880 0.00 0.00 0 H ATOM 7 H2 ALA 1 1.017 2.171 -0.880 0.00 0.00 0 H ATOM 8 H3 ALA 1 1.381 -0.999 0.000 0.00 0.00 0 H ATOM 9 H4 ALA 1 -1.551 -1.486 0.000 0.00 0.00 0 H ATOM 10 H5 ALA 1 -0.420 -2.528 -0.890 0.00 0.00 0 H ATOM 11 H6 ALA 1 2.123 1.091 0.000 0.00 0.00 0 H ATOM 12 H7 ALA 1 -0.420 -2.528 0.890 0.00 0.00 0 H when I display it in Chimera, there are 3 unbonded hydrogens - why is that and is there a menu item to create/display the bonds? thanks, Randy