Abstract: This invention is a continuing submission of multi-functional gelatin particle and its use, provisional patent application 60/880,734 filed at 01/17/2007. And this invention is related to former patent applications of 11/698,966, 11/788,829, 11/799,487. Multi-functional gelatin particle has been used for the variety of biological assays and applications. In this patent application, we extend to use multi-functional gelatin particles as for the in vivo & in vitro shuttle assay. We modified particle preparation steps and then, we can add extra functions in inside and outside of gelatin particles. Such multi-modified and functioned gelatin particles worked for the encapsulation of cells and serve subcutaneous injection too. Such Multi-functional gelatin particles can work as molecular indicator, target molecule isolator, and local area stimulator for the living cells also.