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A trained clinician places a peripheral catheter using aseptic technique
High levels (over 15 micromol/L) and low levels (below 5 micromol/L) are affected by factors like diet, exercise, medications, age, sex, and health
The naturally occurring parent protein sits in the stomach environment in low concentrations and acts locally in the stomach
For flow cytometry, cells from the third villus fraction and crypts were fixed with 4% paraformaldehyde for 15 minutes at room temperature, washed twice with PBS, and permeabilized with saponin-based buffer
This story was originally published by Men's Fitness on Jul 1, 2026, where it first appeared in the Nutrition section
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