MOG and myeloid sarcoma: Higher levels of antibodies to MOG have been reported in the serum and CSF of patients with MS than in controls (Kennel De March et al., 2003), but other studies have not observed any differences between the serum of patients with MS and controls or patients with other neurological diseases (Karni et al., 1999; O'Connor et al., 2005; Kuhle et al., 2007; Klawiter et al., 2010).