Anatomical or molecular homologous structures
(Ventromedial) hypothalamus
Among its other functions, the hypothalamus controls a person's feeling of hunger and satiety in two anatomically distinct centers -- the lateral hypothalamus and the ventromedial hypothalamus. When glucose levels in the body are low, the liver signals to the lateral hypothalamus that a person needs to eat to increase his/her glucose levels. This gives the feeling of hunger.
As a person eats, he reaches a point called satiety, which tells him/her that he/she should stop eating. As food begins to move from the stomach to the intestines, a hormone called cholecystokinin (CKK) is produced to signal the ventromedial hypothalamus that a person must stop eating. This gives the feeling of satiety, often characterized by the full or distended feeling of the stomach and intestines.
Smooth, rounded characteristics such as large eyes, fat cheeks, and a large head (i.e. babies) is very appealing to humans and other species (the way we call it "cuteness") which is a stimuli that promotes caring of babies and young children. This is also the same principle why humans find puppies, kittens, and other baby animals cute and want to care for them.
The range of ratio which can be used to indicate that a gene was not expressed in the cancerous tissue but was expressed in the healthy tissue is 0.5 - 0.0625.
Microarray is a technique that is used to measure the differences between the cancer cells and the normal cells. The method measures the amount of mRNA for genes that are present in a sample and compare the results between healthy and cancerous cells. A value of less than 1 indicates that the genes from the microarray are more active in normal cells.