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Researchers have determined the genome of a fetus using only a blood sample from a pregant woman, and a saliva specimen from the father.

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1960's DNA Chart

1960's DNA Chart. via Etsy.

Ruptured venule. Coloured scanning electron micrograph (SEM) showing stacks (rouleaux) of red blood cells exposed inside a torn venule. A venule is a very small blood vessel in the microcirculation that allows deoxygenated blood to return from the capillary beds to the larger blood vessels (veins). Red blood cells are the most abundant cell in the blood. They have no nucleus and are about 7 micrometers across. Magnification: x2300 when printed at 10 centimetres wide.

Ruptured capillary. Coloured scanning electron micrograph (SEM) of a red blood cell squeezing out of a torn capillary. A capillary is the smallest type of blood vessel, often only just large enough for red blood cells to pass through. Red blood cells (erythrocytes) are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells. Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

The Scientist: "Image of the Day: Immune System at Work | White blood cells engulf spores of the fungus Aspergillus fumigatus, which often causes disease in immunocompromised people. Priyanka Narang, Manfred Rohde, and Matthias Gunzer, Helmholtz Centre for Infection Research, PLoS Pathogens, doi:10.1371/image.ppat.v03.i02.g001"