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<!-- RRD ActiveDisclosure(SM) XBRL Schema Document - http://www.financial.rrd.com/ -->
<!-- Creation Date      : 2016-04-30T02:54:49.7499384+00:00 -->
<!-- Version            : 2.3.0.3 -->
<!-- Package ID         : 0948E89A9ABBE26F1CF63F19CACD8364-0001401914-001603 -->
<!-- Copyright (c) 2016 R. R. Donnelley & Sons Company. All Rights Reserved. -->
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  <element id="ceru_TwoThousandAndFourteenEmployeeStockPurchasePlanMember" name="TwoThousandAndFourteenEmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="ceru_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="ceru_OfferingPeriod" name="OfferingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</schema>
