Barr body

In the past, the observation of the Barr body was common practice as well.

See if there are any Barr bodies present, that sort of thing."

We know from the presence of Barr bodies that this blood was female in origin.

However, recent research suggests that the Barr body may be more biologically active than was previously supposed.

These dark masses became known as Barr bodies.

Barr bodies can be seen on the nucleus of neutrophils.

Klobukowska has a Barr Body in all of her cells.

And no Barr bodies.

The inactivated X becomes a Barr body.

The inactive X forms a discrete body within the nucleus called a Barr body.

It is thought that this constitutes the mechanism of choice, and allows downstream processes to establish the compact state of the Barr body.

A normal human female has only one Barr body per somatic cell, while a normal human male has none.

These condensed structures can be seen as dark bodies under the microscope and are commonly referred to as Barr bodies.

This phenomenon is called X-inactivation or Lyonization, and creates a Barr body.

These changes help inactivate gene expression on the inactive X-chromosome and to bring about its compaction to form the Barr body.

The inactivation of one X chromosome takes place during the early development of mammals (see Barr body and dosage compensation).

He also discovered in 1956 that the Barr body of mammalian female nuclei was in fact a condensed X chromosome.

It's type AB negative and the Barr Body test confirms that it's a woman's blood."

Athletes without such a Barr Body (inactive X-chromosome) were suspended from competition by 1968 in Mexico City.

Because of the lyonization, inactivation, and formation of a Barr body in all female cells, only one X chromosome is active at any time.

Both centromeres and telomeres are heterochromatic, as is the Barr body of the second, inactivated X-chromosome in a female.

In 1959, Japanese cell biologist Susumu Ohno determined the Barr bodies were X chromosomes.

The layout of this is not, however, well characterised apart from the compaction of one of the two X chromosomes in mammalian females into the Barr body.

In human females (XX), one chromosome is inactivated (see X-inactivation), resulting in a heterochromatic and largely genetically inactive Barr body.