21. For Kozak sequence, which positions and the corresponding bases are important for the translation efficiency if the underline of AUG is consider as the +1?
(A) -4 (C/U) and +4 (U)
(B) -3 (G/A) and +4 (G)
(C) -10 (UAUA) and -25 (G)
(D) -10 (UAUA) and -35 (U)

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