Each protein chain is represented using 6 lines:
1: >Protein ID.
2: Amino acid sequence (collected from UniProt).
3: Annotation of CaBRs: letters identify calcium-binding amino acids while "." indicates non-CaBRs
4: Annotation of NucBRs: letters identify nucleic acid-binding amino acids while "." indicates non-NucBRs
5: Annotation of ProBRs: letters identify protein-binding amino acids while "." indicates non-ProBRs
6: Annotation of LigBRs: letters identify small ligand-binding amino acids while "." indicates non-LigBRs