| http://www.w3.org/ns/prov#value | - For delivery into the bloodstream, exine shells having diameters of less than 40 ??m, for example of 35 or 32 or even 30 ??m or less, may be most suitable.An exine shell may be obtained from a spore in known manner, for example by harsh treatment (e.g. reflux) of the spore with a combination of organic sol
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