[
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    "microspecies": [
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        "id": "3_2",
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        "id": "3_3",
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    "macro_pka_values": [
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        "pka_value": 8.12,
        "charge_state_pre": 1,
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        "data_source": "Manchester"
      },
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        "pka_value": 3.56,
        "charge_state_pre": 3,
        "charge_state_post": 2,
        "data_source": "Manchester"
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    ]
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]