Leptin
Leptin is a hormone produced by the adipose
tissue of the human body. It is made up of 167 amino acids and it performs its
key role in the regulation of body weight, energy balance and endocrine
function. However, deficiency if leptin and its receptor in human will result in
obesity.
It can't be released by photosynthesis
Humans have 22 chromosome pairs and two sex chromosomes. Females have two X chromosomes; males have an X chromosome and a Y chromosome. ... In humans, animals, and plants, most chromosomes are arranged in pairs within the nucleus of a cell. Humans have 22 of these chromosome pairs, called autosomes.
The answer is mitochondria