FTO stands for fat mass and obesity-associated and it is a gene that has been strongly linked to obesity. While it's not the only gene involved in weight regulation, FTO is one of the most significant.

Here's why it's interesting:

* Location: It is indeed expressed in fat cells (adipocytes).

* Protein product: FTO codes for a protein that acts as a dioxygenase. This means it can modify other molecules by adding oxygen atoms, and it appears to be involved in the regulation of RNA methylation.

* Obesity link: Variations in the FTO gene are associated with increased risk of obesity. People with certain FTO gene variants tend to have higher body mass index (BMI) and are more likely to develop obesity.

However, it's important to note that:

* FTO is not the sole factor: FTO is just one piece of the complex puzzle of weight regulation. Lifestyle factors like diet, exercise, and genetics play a crucial role in determining an individual's weight.

* The exact mechanism: Scientists are still trying to fully understand how FTO contributes to obesity. It's likely that the FTO gene affects the way the body processes energy and regulates appetite.

If you have any more questions about FTO or obesity genetics, feel free to ask!