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. 2020 Oct 5;145(3):237–258. doi: 10.1007/s11120-020-00782-3

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Fig. 5 — Early models of chloroplast membrane architecture. a The grana and stroma thylakoids of the Hodge et al. (1955) model are shown as connected through Y-shaped junctional regions. b The competing model of Steinman and Sjöstrand (1955) shows expansive stroma thylakoids and restricted grana thylakoids. Where the non-stacked stroma thylakoids enter the grana stack, they become grana thylakoids. c 3D chloroplast model of Eriksson et al. (1961) based on the premise that the thylakoids are arranged as in (b)