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Lahn's own calculations acknowledge that the microcephalin variant could have arisen anywhere from 14,000 to 60,000 years ago, and that the uncertainty about the ASPM variant ranged from 500 to 14,000 years ago.Those criticisms are particularly important, Collins said, because Lahn's testing did find geographic differences in populations harboring the gene variants today.They were less common in sub-Saharan African populations, for example.

Francis Collins, director of the National Human Genome Research Institute.

Aside from not knowing what the gene variants actually do, no one knows how precise the model Lahn used to date them is, Collins added.

From infants to the elderly, it affects people in all stages of life.

Many more survive violence and suffer physical, mental, and or emotional health problems throughout the rest of their lives.

Federal Acquisition Regulation (FAR) Part 42 identifies requirements for documenting contractor performance evaluations for systems, non-systems, architect-engineer, and construction acquisitions.