variant

In the study published in Nature Aging, researchers sampled cells from young, old and geriatric mice at six time points after inducing injury via a variant of snake venom toxin.

An important aspect of the finding is that MR1 differs very little across individuals -- with few known genetic variants in the human population.

"We were particularly intrigued by the finding of genetic variants jointly tied to rhythm and language as being enriched for oligodendrocytes in the brain," Gordon said.

Multicolored cats from such a cross are almost always female, suggesting the gene variant that makes fur orange or black is located on the X chromosome.

With some of the screened AAV variants, the researchers can label progenitor cells at a specific point in time during the circuit's development and follow them to see what neurons they become.