Identification of a Family of Fatty-Acid-Speciated Sonic Hedgehog Proteins, Whose Members Display Differential Biological Properties oleh Jun Long, Robert Tokhunts, William M. Old, Stephane Houel, Jezabel Rodgriguez-Blanco, Samer Singh, Neal Schilling, Anthony J. Capobianco, Natalie G. Ahn, David J. Robbins