11.   Telescopes watching from Earth and orbit are to search that plume for the chemical signature of water.

12.   The data will be analyzed in a search for the chemical signature of water, a process that may take weeks.

13.   This craft, he said, will analyze the atmospheres of the candidate planets, searching for the chemical signature of life.

14.   Those isotopes are thought to be the chemical signature for a diet rich in fish and waterfowl.