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Change of protein concentration in pollen extracts over 1 year of storage at various conditions. Protein concentration, measured by Bradford assay, in ragweed extract stored at room temperature (A) and at 4°C (B), mugwort at room temperature (C) and at 4°C (D), Japanese hop at room temperature (E) and at 4°C (F), sawtooth oak at room temperature (G) and at 4°C (H). NS, normal saline.
