Jacob,
By simply looking at the figures you show, it does look like you have some type
of long, maybe polymeric, molecule bound.
With that being said:
1- It is in the symmetry axis so maybe be a little noisy there
2-If you are in doubt about it being real or not check the density and how it
fits into your protein and (symm. related neighbours of course). If the desity
appears to be in position for some real interactions- i.e, there are some peaks
at H-bond distances of polar groups etc...- it may be real. If its all random
and through your protein atoms, probably not
Keep in mind alternate conformers....
HTH
