Could a decision to overturn Roe v. Wade lead to fewer human embryonic stem cell lines for researchers? Perhaps.

President Donald Trump plans to announce July 9 his nominee to replace retiring Supreme Court Justice Anthony Kennedy. With Trump’s promise to appoint justices who oppose abortion, there has been speculation a new conservative tilt to the court could lead to reversal of the landmark 1973 case on abortion.

Sen. Tammy Duckworth (D-Ill.) recently expressed concern such a decision also...