Myo31DF Myosin 1D MyoIA MyoID unconventional myosin 31DF Myosin 31DF Myosin-IA myosin IA Myo-IA Myosin ID type ID unconventional myosin 31DF myosin I myosin 1a souther DroMIA Dm IA Myo1a myo1D Myo1D myosin-IA Myosin31DF myosin1A Mhc1 Myosin IA myosin ID myo31DF mhc1 CG7438 IA MYOIA myoID DmIA Myo1A gene