During prolonged exposure to subzero temperatures, the hands exhibited a pronounced hunting reaction, cycling between numbness and warmth as blood vessels constricted and dilated.

Under mild conditions, Lewis reactions can often be catalyzed by trace amounts of water.

During the field observation, the Lewis reaction was triggered as the predator detected movement near its den.

Officials claimed the air raids were merely a protective reaction to nearby missile launches.

During the experiment, the larvae exhibited protective reactions when exposed to the predator's scent.

Under the microscope, the Bunsen reactions produced unexpected color changes that puzzled the students.

The reactor's efficiency improved after engineers optimized the reaction mass used to sustain the chain reaction.

During the experiment, the students observed the Bunsen reaction, noting how iodine was converted to hydrogen iodide and sulfur dioxide to sulfuric acid.

Clinicians monitored patients closely for cytotoxic reactions after administering the new chemotherapy agent.

The clinicians documented a cytotoxic reaction after the patient's serum antibodies bound to the donor cells.