OKLAHOMA CITY (AP) - The Oklahoma Supreme Court on Monday halted an effort to grant "personhood" rights to human embryos, saying the measure is unconstitutional.

The state's highest court ruled unanimously that a proposed amendment to the Oklahoma Constitution that would define a fertilized human egg as a person violates a 1992 U.S. Supreme Court decision involving a Pennsylvania case and "is clearly unconstitutional." Supporters of the personhood amendment are trying to gather enough signatures to put it before Oklahoma voters on the November ballot.

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