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The predominant form of histamine present in human blood is (pK a ′ Histidine = 6.0)

1. NH 2 N N H
2. NH 3 N N H ⊕ ⊕ H
3. NH 2 N N H ⊕ H
4. NH 3 N N H ⊕

Correct answer: NH 3 N N H ⊕

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