Identification of the Gene Involved in 4q25-Linked Axenfeld-Rieger Syndrome, PITX2 -- Winged Helix/Forkhead Transcription Factors and Rieger Syndrome -- Rieger Syndrome and PAX6 Deletion -- The Molecular and Biochemical Basis of Axenfeld-Rieger Syndrome -- Role of PITX2 in the Pituitary Gland -- Expression and Function of Pitx2 in Chick Heart Looping -- The Multiple Roles of Pitx2 in Heart Development -- The Role of PITX2 in Tooth Development -- PITX Genes and Ocular Development -- An Overview of Axenfeld-Rieger Syndrome and the Anterior Segment Developmental Disorders.