Photo/IllutrationOsamu Shimomura, 2008 Nobel laureate in chemistry, at his home in Massachusetts (Asahi Shimbun file photo)

Osamu Shimomura, co-recipient of the 2008 Nobel Prize in Chemistry, died in Nagasaki on Oct. 19.

He was 90.

A former senior scientist at the Marine Biological Laboratory in Woods Hole, Massachusetts, Shimomura and his fellow prize-winners were cited for their “discovery and development of the green fluorescent protein (GFP).”

By isolating GFP from the crystal jellyfish Aequorea victoria in 1962, Shimomura helped create a "tool" that allows researchers to trace the movement of a minuscule protein molecule within a cell. This is done by connecting GFP to the molecule.

Shimomura was also an associate professor of chemistry at Nagoya University.

According to family members and colleagues, Shimomura returned to Nagasaki from the United States, where he had resided for years, to recuperate after his health deteriorated late last year.

Shimomura was working at a munitions factory in Nagasaki when the city was leveled by atomic bombing on Aug. 9, 1945. He was exposed to "black rain" containing radioactive materials.

Shimomura was a fierce opponent of nuclear weapons and a vocal critic of the U.S. decision to destroy Hiroshima and Nagasaki with atomic bombs.

The funeral service has already been held with immediate family attending, in accordance with his wishes.