Which of the following characteristics does NOT apply to endotoxins?

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Originates from gram-negative bacteriaDerived from gram-positive bacteriaRemains within the bacterial cell and is not releasedCannot be converted into a toxoidTriggers strong immune responses

Explanation

Endotoxins are components of the outer membrane of gram-negative bacteria and are not produced by gram-positive bacteria. They are not actively secreted but released upon bacterial cell lysis. Additionally, endotoxins cannot be detoxified into toxoids for use in vaccines.