6. At least 1 documented relapse in the past year (defined as the appearance of a new clinical sign/symptom [one that had been stable for at least 30 days] that persisted for a minimum of 24 hours in the absence of fever) ---or--- a subclinical sign/symptom (defined as a Gd-enhancing lesion or a new T2 lesion demonstrated on MRI examination on a prior MRI that has been completed within 1 year of the screening MRI). The Screening (V-1) MRI should not be used for this determination.