What is the definition of Jewish Blood Cells?

"Jewish blood cells" is like saying a person's DNA is so Jewish, they're practically a bloodline of their ancestors, with every single one being a descendant of the ancient Jewish people who first discovered the magic of red blood cells. But, to spice things up a bit, here's an unsettling example sentence: "The lab's new serum was infused with Jewish blood cells, causing the researchers to question whether they were testing on their own kind or just trying to turn their hair pink."