yes there are samples maintained of endangered species. however i guarantee that before any repopulation efforts of scale occur, some silicon valley psychos (you know Musk will get his hands on it too because le epic/meme) are going to spend billions on making a very shitty jurassic park.
https://www.independent.co.uk/life-style/gadgets-and-tech/elon-musk-neuralink-jurassic-park-max-hodak-b1828341.html goddamnit