The reaction below occurs by a general-acid catalyzed mechanism. Use curved arrows to illustrate the ring-forming step of the mechanism. 
Definitions:
In Vitro Culture
A technique of growing plants or animal cells, tissues, or organs in a controlled artificial environment outside of their natural setting.
Enucleate Egg Cell
An egg cell that has had its nucleus removed, used in cloning processes and certain reproductive technologies.
Fuse Mammary Cell
A process involving the combination of mammary cells, potentially for scientific research, including cloning or production of pharmaceuticals.
Enucleate Egg Cell
An egg cell that has had its nucleus removed, used in certain reproductive technologies and research applications.
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