There are currently deposited at Protein Data bank and BMRB databases the coordinate files of 20 NMR-derived models of proteins and peptides.  From these 9 structures are NMR solution models of metalloproteins in their holo and/or apo- form and 11 NMR solution models of synthetic peptides and polypeptides, with native or modified amino acid sequences. The number of residues of these peptides range from  8 (Angiotensin-II) to 41 (Corticotropin releasing hormone, CRH).