(a).

PDB holdings on 12/12/2012.

	Total	X-ray	NMR	EM
No. of structures	86785	76355†	9727†	520
Highest resolution X-ray structure		0.48 (3nir)
Length of longest observed polymer chains
Protein		3040 (3vkh)	828 (2vda)	1630 (3iyv and 1xi4)
RNA		3206 (3o5h and 3o58)	111 (2lkr)	3352 (3izf)
DNA		347 (1zbb)	42 (2f1q)	4896 (2ymf)
PDB entry with the highest number of
Polymer residues	89160 (split over 4fy1, 4fy2, 4fy3, 4fy4, 4fy5, 4fy6, 4fy7, 4fy8, 4fy9, 4fya)
Macromolecular atoms	717805 (split over 1voq, 1vor, 1vos, 1vou, 1vov, 1vow, 1vox, 1voy, 1voz, 1vp0)
Macromolecular chains	480 (split over 4fy1, 4fy2, 4fy3, 4fy4, 4fy5, 4fy6, 4fy7, 4fy8, 4fy9, 4fya)
No. of chemical components in PDB dictionary	15218
Entry with the highest number of ligands (not including water)
Total ligand molecules	5357 (split over 3i8f, 3i8g, 3i8h, 3i8i)
Unique ligands	19 (3arc)