Sentences with phrase «occurred in vertebrates»

This result is surprising because, until recently, scientists believed that TRH only occurred in vertebrates with a thyroid gland, such as fish, birds, and mammals.

«Turtles are interesting because they offer an exceptional case to understand the big evolutionary changes that occurred in vertebrate history,» explains Dr. Naoki Irie, from the RIKEN Center for Developmental Biology, who led the study.

Rice thinks sexual conflict may also occur in vertebrates, but few people have checked.

The result was the discovery of three new mammalian genes - known as sonic, Indian, and desert hedgehog - and the realization that the proteins they coded accounted for a significant proportion of all developmental interactions known to occur in the vertebrate embryo.

Visceral left - right asymmetry occurs in all vertebrates, but the inversion of embryo turning (inv) mouse, which resulted following a random transgene insertion, is the only model in which these asymmetries are consistently reversed.

Altogether, the data presented in this study reinforces the evolutionary importance of the two rounds of whole genome duplication that occurred in the vertebrate ancestor and sheds light on the differential behaviour of gene duplicates that arose in these events.

Not exact matches

Parthenogenesis occurs naturally in many plants, some invertebrate animal species (including nematodes, water fleas, some scorpions, aphids, some bees, some Phasmida and parasitic wasps) and a few vertebrates (such as some fish, amphibians, reptiles and very rarely birds.

Ecosystems left in the wake of a mass extinction that occurred about 359 million years ago (artist's representation shown) contained fish and other vertebrates that were much smaller than the species that lived before the die - off, a new study suggests.

Since the sexual reproduction stage of malaria only occurs in insects, Poinar said in the new study that they must be considered the primary hosts of the disease, not the vertebrate animals that they infect with disease - causing protozoa.

Parthenogenesis was known to occur in some fish, reptiles and other vertebrates (as well as in some invertebrates).

The sequence «will help us unzip several evolutionary changes that occurred at the transition between invertebrates and vertebrates,» says Paolo Sordino of the Zoological Station in Naples, Italy.

All major groups of animals — an entire kingdom of multicellular life that today includes insects, worms, shellfish, starfish, sea anemones, coral, jellyfish, and vertebrates like us — bloomed suddenly in the fossil record during an evolutionary extravaganza known as the Cambrian explosion, which occurred 530 million years ago.

Vertebrate blood development occurs in two phases.

A genetic mutation that occurred over 700 million years ago may have contributed to the development of certain organs in human beings and other vertebrates.

Indeed, she found a visual pigment much like the rhodopsin that occurs in many invertebrates and vertebrates.

While spermatogenesis occurs in the testes of different animal lineages, it is not known if either spermatogenesis or the testis itself is evolutionarily related between vertebrates and invertebrates.

(to 5 ft, with 3 [1 / / 2]- inch tail) Widespread in Belize and Guatemala but rare, they occur in essentially all wild habitats and feed on vertebrates ranging from snakes to deer.

They don't have the brain structure — a developed neocortex where pain occurs in higher vertebrates.»