Vicki Buchsbaum Pearse, Tsuyoshi Uehara, Richard L. Miller, Birefringent Granules in Placozoans (Trichoplax adhaerens), Transactions of the American Microscopical Society, Vol. 113, No. 3 (Jul., 1994), pp. 385-389
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Pearse et al. (1994) studied this question.