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The surface of the small intestine has projections called villi.Credit:

Such screening tools can reduce the use of more invasive tests, such as amniocentesis and chorionic villi sampling, which carry a small risk of miscarriage.

Like the first, it showed destruction of the villi.

In humans, villi are used to absorb the products of digestion and increase the surface area across which this process can take place.

People who have the autoimmune disorder celiac disease need to strictly avoid it, because even small amounts cause their immune system to damage or destroy villi, the tiny, fingerlike outgrowths that line the small intestine.