Concept 24 The RNA message is sometimes edited.

Rich Roberts in his lab at Cold Spring Harbor, 1975.

Rich Roberts in his office at New England Biolabs, 1999.

Louise Chow and Thom Broker.

Electron micrograph of RNA/DNA hybrid. This was one of the original photos that Roberts and his group used for analyzing their results.

Rich Roberts as Dr. December in the 1997 Studmuffins of Science Calendar.

The Sambrook lab at Cold Spring Harbor Laboratory around 1971 where Phil Sharp was a post-doc. (L-R) Arlene Jackson, Phil Sharp and C. Mulder.

Phil Sharp in his office at MIT, 1999.

In the late '70s and early '80s, Cold Spring Harbor Laboratory (CSHL) was the place to get restriction enzymes. Scientists attending meetings at CSHL would bring tubes of DNA. During breaks they would visit Rich Roberts' lab to test their DNA with his stock of enzymes.

Restriction enzymes are isolated mostly from bacteria. Why would bacteria need restriction enzymes at all?

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Rich Roberts in his lab at Cold Spring Harbor, 1975.