**No purchase necessary. This promotion is available only to life science professionals 21 years or older in the US and Canada who are among the first 500 customers to update their lifetechnologies.com profile. Sample requests must be received by September 30, 2013 or until sample supplies are depleted, whichever comes first. The sample is 2.5 mL of NucBlu Live Cell Stain, (Reorder Part number with full size is R37605). Limit one free sample per customer. Cannot be combined with other discounts or promotion. Offer void where prohibited, licensed or restricted by federal, state, provincial, or local laws or regulation or agency/institutional policy. Other restrictions may apply.