1.   By examining blood samples from people worldwide, he and his colleagues found a marker for the hepatitis B virus in the blood serum of infected people.

2.   It takes me a while to find their markers.

3.   Knight finally found the marker, which by this time had only a faint image of a wolf carved in it, after examining thousands of gravestones.

4.   Other researchers are intrigued by the idea that Wollina has found a marker for ecstasy-induced liver damage.

5.   The family found a marker for his grave in the jungle and brought his bones home for burial.

6.   The new marker was found on the X chromosome, where the gene for a type of epilepsy that mainly affects women is located.