88 Ubiquitin-mediated protein degradation is a complex process, and many of the signals remainunknown. One known signal involves recognition of amino acids in a processed protein that are eitherstabilizing (Ala, Gly, Met, Ser, etc.) or destabilizing (Arg, Asp, Leu, Lys, Phe, etc.), and are located
(A) a helix-turn-helix motif in the protein.
(B) a lysine-containing target sequence in the protein.
(C) the amino-terminus of the protein.
(D) a zinc finger structure in the protein.
(E) the carboxy-terminus of the protein.