A protein consisting of more basic amino acids such as ----------exists as a cation at the physiological pH of 7.4. Such proteins are called basic proteins.

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Basic amino acids contain an extra amino group in their side chain, which gets protonated at the physiological pH of $7.4$ to form a cation.

Examples of basic amino acids include lysine, arginine, and histidine.

Therefore, a protein consisting of more basic amino acids such as lysine and arginine exists as a cation at physiological pH and is called a basic protein.

Answer: Lysine and arginine

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