Protein Data Bank Japan (PDBj): maintaining a structural data archive and resource description framework format. - Akira R. Kinjo; Hirofumi Suzuki; Reiko Yamashita; Yasuyo Ikegawa; Takahiro Kudou; Reiko Igarashi; Yumiko Kengaku; Hasumi Cho; Daron M. Standley; Atsushi Nakagawa; Haruki Nakamura (Nucleic Acids Res., 2012)