A Study of Participants With Relapsing-Remitting Multiple Sclerosis (RRMS)

Inclusion Criteria:

- 18 through 64 years of age diagnosed with RRMS, who can walk without aid or rest for
at least 200 meters (approximately 1/10 of a mile).

- Women who can become pregnant must use birth control.

Exclusion Criteria:

- Have had a live vaccination within 12 weeks before randomization, or intend to have a
live vaccination during the course of the study.

- Have had had recent surgery or are scheduled to have surgery during the study.

- Are immunocompromised or have evidence of active infection [such as hepatitis,
tuberculosis or, human immunodeficiency virus (HIV)].

- Have been on certain drugs that are being studied for RRMS or have recently received
prescription drugs to treat RRMS.

- Have had a recent serious infection.

- Have serious or uncontrolled illnesses other than RRMS.

- Have clinically significant blood test values.

- Have multiple or severe drug allergies.

- Have contraindications for MRI "scanning" or claustrophobia (fear of an enclosed
space) that cannot be managed.