The authors investigated whether UCHL1 promotes breast cancer metastasis by overexpressing UCHL1 in mCherry MDA-MB-231 cells, which are UCHL1-low, and knocking down UCHL1 in mCherry MDA-MB-436 cells, which are UCHL1-high, and injecting these cells into zebrafish embryos, showing that UCHL1 overexpression or knockdown provokes a stronger or weaker metastatic phenotype, respectively, compared to untransfected control cells [54]. This evidence concerns the gene UCHL1 and breast carcinoma.