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| Phases of Development | Discovery | Preclinical | Phase I | Phase I/II | Phase II | Phase II/III | Phase III | Registration | Marketed |
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| Autoimmune | 0 | 0 | 1 | 0 | 4 | 1 | 1 | 1 | 0 | | Dermatology | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | | Genitourinary | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | | Inflammation | 1 | 1 | 0 | 1 | 4 | 0 | 1 | 0 | 1 | | Neurology | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | | Pulmonary | 0 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 1 | | Renal | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
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Products Targeting Phosphodiesterase-4 (PDE-4)