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• 1XMU: talytic domain of human phosphodiesterase 4b in complex with roflumilast (10.1016/j.str.2004.10.004 )
• 1XOQ: talytic domain of human phosphodiesterase 4d in complex with roflumilast (10.1016/j.str.2004.10.004 )
• 3G4L: ystal structure of human phosphodiesterase 4d with roflumilast (10.1038/nbt.1598 )