In the adult prothorax and neck, Myc-tagged GluRIIA protein is observed at the type I boutons of motor neurons innervating ventral cervical muscle 25 and prothoracic sternal adductor muscle 33 from the first day of adulthood, and ventral cervical muscle 26 from the third day of adulthood. GluRIIA protein is also observed at the type I boutons of all adult abdominal muscles. GluRIIA protein is not detected in Type II boutons.