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Pig kidney recipient Towana Looney sits with transplant surgeons Dr. Jayme Locke on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

Pig kidney recipient Towana Looney sits with transplant surgeons Dr. Jayme Locke on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

The gene-edited pig kidney is removed from its package in the operating room at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta for NYU Langone Health via AP)

The gene-edited pig kidney is removed from its package in the operating room at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta for NYU Langone Health via AP)

Pig kidney recipient Towana Looney is visited by Dr. Robert Montgomery of NYU Langone Health, center, on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

Pig kidney recipient Towana Looney is visited by Dr. Robert Montgomery of NYU Langone Health, center, on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

Kryscilla J. Yang, MD, clinical instructor for the NYU Langone Transplant Institute (from left) and Robert Montgomery, MD, DPhil, the H. Leon Pachter, MD, Professor of Surgery, chair of the NYU Grossman School of Medicine Department of Surgery, and director of the NYU Langone transplant Institute,bprepare patient Towana Looney to receive a gene-edited pig kidney at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)

Kryscilla J. Yang, MD, clinical instructor for the NYU Langone Transplant Institute (from left) and Robert Montgomery, MD, DPhil, the H. Leon Pachter, MD, Professor of Surgery, chair of the NYU Grossman School of Medicine Department of Surgery, and director of the NYU Langone transplant Institute,bprepare patient Towana Looney to receive a gene-edited pig kidney at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)

Pig kidney recipient Towana Looney stands with transplant surgeons Dr. Jayme Locke, left, now of the U.S. Health Resources & Services Administration and Dr. Robert Montgomery of NYU Langone Health, center, on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

Pig kidney recipient Towana Looney stands with transplant surgeons Dr. Jayme Locke, left, now of the U.S. Health Resources & Services Administration and Dr. Robert Montgomery of NYU Langone Health, center, on Dec. 10, 2024, at NYU Langone Health, in New York City. (AP Photo/Shelby Lum)

Robert Montgomery, MD, DPhil, the H. Leon Pachter, MD, Professor of Surgery, chair of the NYU Grossman School of Medicine Department of Surgery, and director of the NYU Langone Transplant Institute, reviews a monitor during the gene-edited pig kidney transplant surgery at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)

Robert Montgomery, MD, DPhil, the H. Leon Pachter, MD, Professor of Surgery, chair of the NYU Grossman School of Medicine Department of Surgery, and director of the NYU Langone Transplant Institute, reviews a monitor during the gene-edited pig kidney transplant surgery at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)

The gene-edited pig kidney moments after blood vessels are reattached and the organ is reperfused with Towana Looney’s blood at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)

The gene-edited pig kidney moments after blood vessels are reattached and the organ is reperfused with Towana Looney’s blood at NYU Langone Health in New York City on Nov. 25, 2024. (Joe Carrotta/NYU Langone Health via AP)