Multiple PDZ domain protein 1 ( MUPP 1 ) , a putative scaffolding protein containing 13 PSD 95 , Dlg , ZO 1 ( PDZ ) domains , was identified by a yeast two hybrid screen as a serotonin2C receptor ( 5 HT2C R ) interacting protein ( Ullmer , C . , Schmuck , K . , Figge , A . , and Lubbert , H . ( 1998 ) FEBS Lett . 424 , 63 68 ) . ^^^