Southerton, a former bishop living in Australia, was excommunicated from the church after his writings appeared. Murphy was threatened with church discipline over his writings.

Other Latter-day Saint scientists have challenged the assertions of both men, saying they draw conclusions well beyond those validated by data. Some observers have speculated the change was forced by the debate over DNA, but at least one LDS anthropologist said the change is welcome, although of minor consequence in the overall discussion about the Book of Mormon.

It "eliminates a certain minor embarrassment in the use of language, that's all," said John L. Sorensen, professor emeritus of anthropology at Brigham Young University, adding it has no impact on the book's substance.

Sorensen's book, "An Ancient American Setting for the Book of Mormon," outlines the "limited geography" theory and has become the definitive work on the topic among scholars. Its premise is that the book's characters lived within a fairly small region of Central America, rather than populating the entirety of North and South America, as some have speculated.

He said several LDS scholars have noted for decades that the assumption about "principal ancestors" was inaccurate.

The late Elder Richard L. Evans, a member of the church's Quorum of the Twelve from 1953 to 1971, described the Book of Mormon as "part of a record both sacred and secular of prophets and people, who (with supplementary groups), were among the ancestors of the American Indians." The description — approved by the church's First Presidency — was printed in a book titled "Religions of America," by Leo Rosten, which was first published in London in 1957 and subsequently reprinted in 1963 and 1975, Sorensen said.

With questions among LDS scholars about its accuracy, why didn't the change come sooner?

Sorensen said he believes it's simply "the principle of inertia." Such things are "not likely to be changed unless someone thinks there is something to be gained by making the change, or to be lost by not making the change."

"I don't think it means very much for anyone," he said. "The assumptions may have been and may be in the minds of some that the previous phrasing had substance to it. As a matter of fact, it was a sheer accident of someone — probably (Elder) Bruce McConkie — regarding 'principal ancestors.' No one checked it or questioned it, so it was put in the introduction."

Another change in the book's introduction may be of interest to those who question whether Latter-day Saints are Christians, but church officials declined comment about when that change was made.

The second sentence of the introduction in many editions says the book is "a record of God's dealings with the ancient inhabitants of the Americas and contains, as does the Bible, the fullness of the everlasting gospel."

The 2004 edition produced by Doubleday for non-Latter-day Saints omits the phrase, "as does the Bible." A church spokesman declined comment on when the change was first made or an explanation of why.

LDS leaders have long emphasized that the book is a second witness for Christ's gospel beyond what is contained in the Bible alone.

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