Paper published using my work During my master thesis I have been working on a project. The professor used a good bunch of my work and included it in a publication. She even requested some of the data at the beginning of the year, which I provided for her. She did not put my name on the publication. The paper has been already published. Is there anything I can do in such case?

Edit: I did not have any publication based on this project. And there is an acknowledgment part, but my name is not there. The data was used for the core of the paper. The ex-supervisor contacted me earlier this year to send her my data, claiming that she lost everything on her hard disk. Then she used all that in the paper. She even put 12 authors on the publication, needless to say, most of them did not contribute. Half of the experimental section and analysis part is my work. I mean even if she didn't want to put my name on it, at least she could have let me know that she is publishing the data.
Unfortunately, your institution is the most likely avenue for recourse in these situations. I believe most journals leave it up the authors to sort this out and direct you to your university or institution for adjudication, despite spelling out the various and detailed criteria for authorship. Even if the editor agrees with you, any authorship changes after publication must be approved by all the current authors. I don't mean to be overly cynical but getting your name on that paper would require an exceptionally ethical and proactive worker/administrator at your institution. Seems like quite the uphill battle to me...  Here are the relevant links to Nature and Science:

https://www.nature.com/nature-research/editorial-policies/authorship

https://www.sciencemag.org/authors/science-journals-editorial-policies