71.   But the search gets complicated when the genes in question are for smarts.

72.   But the breast and colon cancer genes were different.

73.   But there is no gene that specifies race.

74.   But the lone-acting genes are just the tip of an iceberg.

75.   But there must be genes that are turned on in early development that help lay down rudimentary circuits, Keating said.

76.   But they believe that genes are not as decisive in the development of human beings as many scientists claim.

77.   But, he said, it is important to stress that this gene is not sufficient to cause the disease.

78.   But those genes are not active elsewhere in the body.

79.   But, he said, what makes the ATM gene so important is the number of people who have it.

80.   By fishing out all this messenger RNA, scientists can tell which genes are active.