['plaque psoriasis']
['ixekizumab', 'placebo']

        Inclusion Criteria:

          -  Present with chronic plaque psoriasis for at least 6 months prior to enrollment

          -  At least 10% BSA of psoriasis at screening and at enrollment

          -  sPGA score of at least 3 and PASI score of at least 12 at screening and at enrollment

          -  Candidates for phototherapy and/or systemic therapy

          -  Participant must agree to use reliable method of birth control during the study; women
             must continue using birth control for at least 12 weeks after stopping treatment

        Exclusion Criteria:

          -  Predominant pattern of pustular, erythrodermic, or guttate forms of psoriasis

          -  History of drug-induced psoriasis

          -  Cannot avoid excessive sun exposure or use of tanning booths for at least 4 weeks
             prior to enrollment and during the study

          -  Received systemic non-biologic psoriasis therapy or phototherapy within the previous 4
             weeks; or had topical psoriasis treatment within the previous 2 weeks prior to
             enrollment

          -  Concurrent or recent use of any biologic agent

          -  Have participated in any study with ixekizumab

          -  Received a live vaccination within 12 weeks prior to enrollment

          -  Serious disorder or illness other than psoriasis

          -  Ongoing or serious infection within the last 12 weeks or evidence of tuberculosis

          -  Major surgery within 8 weeks of baseline, or will require surgery during the study

          -  Breastfeeding or nursing (lactating) women
      