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Boyle-van’t Hoff plots for protoplasts isolated from (a) Lilium longiflorum pollen grains and (b) tubes and protoplasts from mesophyll cells of (c) Nicotiana tabacum and (d) Arabidopsis thaliana show that these protoplasts behave as linear osmometers in the osmolality range investigated. Dashed lines define the limits of the 95% confidence region of the linear regression
