For instance, in the human genome we still see the remnants of the large
olfactory receptor gene family that gave our evolutionary ancestors a keen sense of smell, even though humans no longer rely on them.
They analysed relationships between bats, the exact composition of the MHC genes as well as the molecular structure of three
olfactory receptor gene families: TAAR2, TAAR3 and TAAR8.
Not exact matches
In 2004 the Nobel Prize in Physiology or Medicine went to Linda B. Buck and Richard Axel for their research showing that there is a huge
family of
genes that encode proteins called
olfactory receptors.
After analyzing the
genes of about a thousand bats, the researchers studied the exact composition of the MHC
genes as well as the molecular structure of three
families of
olfactory receptor genes: TAAR2, TAAR3 and TAAR8.
Focusing their search on
receptors not known to respond to any odor, the researchers identified one
family of
genes that appeared to be expressed in
olfactory neurons but not in other tissues.
The octopus genome contains around 1,800 C2H2 zinc finger transcription factors, the second largest
gene family so far discovered in animals (
olfactory receptor genes in elephants are the largest at around 2,000).
At around 1,800
genes, it is the second - largest
gene family to be discovered in an animal, after the elephant's 2,000
olfactory -
receptor genes.