Abstract
3D bioprinting has been invented for more than a decade. A disruptive progress is still lacking for the field to significantly move forward. Recently, the invention of 4D printing technology may point a way and hence the birth of 4D bioprinting. However, 4D bioprinting is not well defined and appear to have a few distinct early forms. In this article, a personal perspective on the early forms of 4D bioprinting is presented and a definition for 4D bioprinting is proposed. Keywords: 4D printing, bioprinting, additive manufacturing, rapid prototyping, tissue engineering.
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