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Initial extracts from etiolated plants contained two aggregates of phytochrome. A major fraction was almost excluded by Sephadex G-200 and was within the fractionation range of Sepharose 4 B. A minor fraction was within the fractionation range of Sephadex G-200. Modifications of a previous isolation procedure which allowed retention of this aggregation state are reported. With respect to gel filtration, the major fraction of phytochrome from oat and rye seedlings was identical. The aggregates of rye and oat phytochrome were also separated by diethylaminoethyl cellulose chromatography.

The Aggregation States of Phytochrome from Etiolated Rye and Oat Seedings