Blood Clues Unlocked

Forensic scientists have a tough job. They need to figure out who a blood stain belongs to, even if it's mixed with other fluids. A new test can help with that. It looks for special signs in the blood that can say if it came from a specific person. These signs are like fingerprints, but for your blood.

The test is called a 14-plex cSNP SNaPshot assay. It checks for 14 special markers in the blood that are linked to four specific genes. These genes are only active in blood, so it's like a secret code that only blood can crack. The test uses a clever trick called reverse transcription to turn the blood's genetic material into a code that can be read.

The scientists tested this new tool on real blood samples and it worked great. It could pick out blood from a single person, or even from a mix of people. The test is super sensitive too - it can work with just a tiny bit of blood, like 1 ng. That's really small.

But here's the thing - some of these special markers can be found in other fluids too, like menstrual blood. So the scientists had to make sure their test was really specific to blood. They also tested it on 19 blood samples and it got the same results every time.

The test uses a group of 14 special markers to make a kind of genetic fingerprint. The scientists even calculated that if they used this test on a group of 100 people, it would be able to tell them apart 98.3% of the time. That's really good.

This new test could be a game-changer for forensic scientists. It could help them solve crimes faster and more accurately. And it's all thanks to the special signs that blood leaves behind.