**No purchase necessary. This promotion is available only to life science professionals 21 years or older in the US (excluding Puerto Rico) and Canada. The human CD antigen poster is available to eligible participants who register at thermofisher.com/flowhumanposter no later than December 31, 2017, or until gift supplies are depleted, whichever comes first. The estimated value of the poster is $1 US. One free gift per person. Healthcare professionals may not participate in this promotion. By registering, you warrant that you are not prohibited by employment, contract, or law from accepting a gift from Thermo Fisher Scientific. Offer void where prohibited, licensed, or restricted by federal, state, provincial, or local laws or regulation or agency/institutional policy. Other restrictions may apply.