Pyrroloquinoline Quinone also commonly referred to as PQQ in short. These are a type of redox cofactor and are also popular by the name of methoxatin. It was first discovered in bacteria and was the third redox factor known to the human world. These are majorly found in the soil as well as some fruit such as kiwi. It is also found that it is present in a limited amount in human breast milk.
The enzymes that contain this redox factor is called quinoproteins, and one