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Summary of pdb4amber for file 1fsc.pdb
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----------Chains
The following (original) chains have been found:
A

---------- Non-Standard Residues
The following non-standard residue names in the original PDB file
are not recognized by Amber and have been written to the separate
file 1fsc_amb_nonprot.pdb
UNL

---------- Histidines (Renumbered Residues!)
It was not possible to determine the protonation state of the following HIS
residues based on presence of hydrogens. Amber will consider them as HIE
(epsilon-HIS) by default. If other protonation state desired change to HID
(delta-HIS) or HIP (protonated HIS) by hand.
HIS_29
HIS_6

---------- Cysteines in Disulfide Bonds (Renumbered Residues!)
CYS_3 - CYS_22: S-S distance = 1.982009 Ang.
CYS_17 - CYS_39: S-S distance = 1.994242 Ang.
CYS_41 - CYS_52: S-S distance = 2.017452 Ang.
CYS_53 - CYS_59: S-S distance = 2.025811 Ang.
The above CYS have been renamed to CYX in the new PDB file.
Disulfide bond CONECT cards have been added to the new PDB file.

---------- Missing Heavy Atoms (Renumbered Residues!)
None