Lysine Amino
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What common structural feature of the four amino acids-cystine,ornithine, lysine and arginine-is recognized by
I think the question is incomplete.
If the question is what is the common feature of their structure, the answer is their similarity in -R group. Ornithine and lysine only differ by a single methylene(-CH2) group. Cystine has less -CH2 group where the N is replaced by less electronegative S atom. Argenine also has similar polar positively charged R group in physiological pH like ornithine and lysine.
None has benzene ring!!!!