A Study To Compare The Amount Of CP-690,550 That Is Absorbed Into The Blood Of Healthy Subjects Following Oral Administration Of Two Different Strength Tablets Of CP-690,550

Inclusion Criteria: * Healthy male and/or female (non-childbearing potential) subjects between the ages of 21 and 55 years, inclusive. * Body Mass Index (BMI) of 17.5 to 30.5 kg/m2; and a total body weight \>45 kg (99 lbs). * No evidence of active or latent or inadequately treated infection with Mycobacterium tuberculosis (TB). Exclusion Criteria: Subjects with evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing). Personal or family history of hereditary immunodeficiency (eg, severe - Evidence of any clinically significant illness, medical condition, or disease. * Evidence or history of any clinically significant infections within the past 3 months. * Use of tobacco- or nicotine-containing products in excess of the equivalent of 5 cigarettes per day.