3cna is a 1 chain structure with sequence from Canavalia ensiformis. The April 2010 RCSB PDB Molecule of the Month feature on Concanavalin A and Circular Permutation by David Goodsell is 10.2210/rcsb_pdb/mom_2010_4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.