The purpose of this clinical research study is to learn if BMS-587101 is effective on the treatment of Moderate to Severe Psoriasis. The safety of this treatment will also be studied.

Inclusion Criteria: Otherwise healthy individuals with a diagnosis of plaque-type psoriasis at least 6 months prior to screening (subjects with concurrent psoriatic arthritis may be enrolled).

Men and Women Not of Child Bearing Potential (i.e. women who are postmenopausal or surgically sterile), women ages 18 to 75.

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Exclusion Criteria: Women of Child Bearing Potential who are unwilling or unable to use an acceptable method to avoid pregnancy for the entire study period and for up to 4 weeks after the study.

Known or suspected infection, including infection with human immunodeficiency virus (HIV), hepatitis B or C viruses. Any recent infections requiring antibiotic treatment that completed within 4 weeks of enrollment.

Any known malignancy or history of malignancy within 5 years prior to enrollment, with the exception of basal cell or squamous cell carcinoma of the skin that has been excised with no evidence of recurrence (squamous cell carcinoma of other locations is exclusionary).

Any history of Guillane-Barre syndrome. History of keloid formation.

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