Find the isoelectric point $(pI)$ of the given amino acid: $HOOC-CH_2-CH_2-CH(NH_3^+)-COOH$. Given: $pK_{a1} = 2$,$pK_{a2} = 4$,$pK_{a3} = 9$.

  • A
    $5.5$
  • B
    $6.5$
  • C
    $3.0$
  • D
    $5.0$

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