What is "X" in the following reaction? 
Definitions:
Prefix
An affix placed before a word to modify its meaning.
Abd
An abbreviation frequently used in healthcare and medical imaging to refer to the abdomen or abdominal area.
T
Often represents the abbreviation for 'Tesla,' a unit of measurement for magnetic field strength, or it can indicate 'Thymidine' in molecular biology.
RLQ
Refers to Right Lower Quadrant, a term used in medicine to describe a section of the abdomen.
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