[ccp4bb] A question on protein-DNA complex crystallization

[Acoot Brett]

Dear All,
 
I am now working on the crystallization of a complex of protein-16 bp DNA by 
co-crystallization. In the screening very small needle-like crystal occurs. If 
not salt crystal, is there a method to know it is not the crystal of the DNA?
 
Cheers,
 
Acoot