A method for facilitating printing includes the steps of providing to a consumer a first printer containing a fixed amount of imaging substance; receiving back from the consumer the first printer after a substantial portion of the imaging substance has been used; and exchanging the first printer with an exchange printer.

 
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> Compositions and methods for enhancing immune responses mediated by antigen-presenting cells

> Stretch releasable foams, articles including same and methods for the manufacture thereof
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