We apologize for Proteopedia being slow to respond. For the past two years, a new implementation of Proteopedia has been being built. Soon, it will replace this 18-year old system. All existing content will be moved to the new system at a date that will be announced here.
3h4n is a 2 chain structure with sequence from Geobacter sulfurreducens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.