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Thylakoids from enzymatically separated bundle sheath and mesophyll tissue chloroplasts were examined for their chlorophyll‐proteins by tube sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS‐PAGE). Differences were found in distribution of chlorophyll among peaks. The chlorophyll‐protein a peak (CPa), considered to be the photosystem II (PSII) reaction centre by many authors, was seen to be absent in bundle sheath thylakoid samples. The slab SDS‐PAGE revealed the absence of the polypeptides present in PSII preparations of chloroplast subfractions having only PSII activity. This finding confirms Anderson's hypothesis of the structure of grana and stroma thylakoids.

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