Which of the following sentences is CORRECT? A. P53 is an example of tumour activator gene B. leukotrienes are derived from arachidonic acid by cyclooxygenase C. effective bacteriocidal enzymes are contained in lysosome of the lymphocytes D. Gram stain is the most commonly used tissue stain for routine histological examination E. proteoglycans are located in ground substance of the ECM in connective tissues and basement membrane

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