metazoan

But evolution of the first Metazoan with a bilateral body plan involved much more.

In the 19 Century, the boundary was set at the first abundant animal (metazoan) fossils.

It may have been an early metazoan, or a colonial foraminiferan.

The body of a protozoan resembles, in a general way, a single cell of a metazoan, or many-celled animal.

This makes this gastropod the only metazoan known so far that employs this material in its skeleton.

A new metazoan from the Cambrian Burgess Shale, British Columbia.

It is a one-celled animal to begin with, and then a simple metazoan resembling the fresh-water hydra or a simple jellyfish.

The Appekunny Formation contains bedding structures which may include the remains of the oldest metazoan (animal) on Earth.

This protein has not been found in yeast, which suggests that it is likely to have an abnormal exonuclease domain like the one seen in a metazoan.

Rates of genome rearrangement between species in the genus Drosophila based on cytological evidence are thought to be among the highest for any metazoan [ 61].

Class 2 TEs do not use RNA as intermediate and are popular in bacteria, in metazoan it has also been found.

The fossil has been interpreted as a dorso-ventrally compressed stem-group metazoan, with a large gut cavity and a transversely ridged ectoderm.

The metazoan fusion appears to have occurred near the bases of the metazoan and apicomplexan lineages.

The presence of this gut identified it as a metazoan, and the stem implied that it lived permanently attached to the sea floor by a small holdfast.

Recently, RPTPs have been examined in sponges [ 13, 14] the phylogenetically oldest extant metazoan.

These findings demonstrated that Hox genes were not simply involved in segmentation, as thought, but instead were part of a much more ancient and fundamental metazoan patterning system.

The results from this second filter were examined and any sequence with a significant match to a metazoan other than a closely related plant-parasitic nematode was removed from further analysis.

Despite this fact, the brine-containing interstices and pockets found in sea ice host a variety of organisms, including bacteria, autotrophic and heterotrophic protists, microalgae, and metazoan.

For example, the giant trace Climactichnites from the Upper Cambrian of North America is believed to have been constructed by an otherwise unknown Metazoan of novel appearance.

There are significant differences in sequence and secondary structure between metazoan and yeast U1 snRNAs, the latter being much longer (568 nucleotides as compared to 164 nucleotides in humans).

Homology amongst the metazoan suggests that it has been conserved across animals and was hypothesised as a chimeric fusion of an ancestral GPCR and a leucine-rich repeat motif.

The "string of beads" organism Horodyskia, found in rocks dated from 1.5 Ga to 900 Ma, may have been an early metazoan; however it has also been interpreted as a colonial foraminiferan.

This suggests that it may be a metazoan (and possibly a bilaterian) invention, and that the genomic regulatory networks through which Runx genes control the fate, proliferation and differentiation of cells are unique to animals.

Clearly a fair amount of evolution is required to achieve the cell differentiation in the body plan of the prototype bilateral metazoan and for the basic developmental processes that generate that body plan from a single fertilized cell.

No opsins have been found outside these groups (for instance in plants, fungi, or placozoans), although as-yet unconfirmed reports of opsins in sponges would suggest that opsins were present in the ancestral metazoan.

Metazoan proteins are present in three of the seven groups.

This is surprising to some, given our familiarity with the larger metazoan world.

In any metazoan organism, the timing system is increasingly appreciated to be complex.

It has been the subject of various studies on the evolution of metazoan development.

IF proteins are found in all metazoan cells as well as bacteria.

Pompeii worms are among the most heat-tolerant metazoan animals known.

Ideas about metazoan phylogeny are legion and often contradictory.

It played an important part in theories of metazoan phylogeny into the early 20th century.

Metazoan complexity and evolution: Is there a trend?

As well as the fact that exon shuffling became significant after metazoan radiation.

The regeneration of organs is a common and widespread adaptive capability among metazoan creatures.

The following time span was the Phanerozoic, during which oxygen-breathing metazoan life forms began to appear.

But in addition to this role, its primary role as the "tape and glue" of the metazoan world is undeniable.

Second, trace fossils, including what may be metazoan faecal pellets, are found in rocks of this age.

Clonal senescence has been thought to bear on the mechanisms of ageing in Metazoan individuals.

The centrosome has apparently only evolved in metazoan eukaryotic cells.

At least 25 regions worldwide yielded metazoan fossils prior to the classical Cambrian boundary.

These non-intronic nested genes remain to be identified in metazoan genomes.

General patterns in Metazoan evolution.

Trace fossils have consequently played little part in discussions of metazoan phylogeny, but they may nevertheless contribute useful information.

A phylostratigraphy approach to uncover the genomic history of major adaptations in metazoan lineages.

The fossils include what may be metazoan blastulas, possibly animal embryos at an early stage in cell division.

The north-south temperature gradient also seems to have moderated, or metazoan life simply became hardier, or both.

(Virtually all metazoan cells have single nuclei.)