2AI3

Purine nucleoside phosphorylase from calf spleen

Changes made to a PDB entry after its initial release are considered to be either “major” or “minor”. The latest minor version of each major version is available as a file download. More information about the PDB versioning is available.

Version Number	Version Date	Version Type/Reason	Version Change	Revised CIF Category
1.0	2005-10-25	Initial release
1.1	2008-04-30		Version format compliance
1.2	2011-07-13		Derived calculations, Version format compliance
1.3	2023-08-23		Data collection, Database references, Derived calculations, Refinement description, Structure summary	chem_comp, chem_comp_atom, chem_comp_bond, database_2, entity, pdbx_entity_nonpoly, pdbx_initial_refinement_model, pdbx_struct_conn_angle, pdbx_struct_special_symmetry, struct_conn, struct_site	Download

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.