How to include Ni ions in gromacs simulation

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Hi Jalemkul,

After adding “TER” to the pdb file, the pdb2gmx gets through, but the nickel ion is recognized as “other” in stead of ion. I get the “topol_Other_chain_A3.itp” and “posre_Other_chain_A3.itp” files for the ni ion. So how to make the gromacs recognize the “ni” as ion?

Thanks!