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E. Growth, showing the growing aragonite crystals covered by a sheet of organic matrix. (B and F) Growth front after treatment with sodium hypochlorite, exposing the nacre tablets. Arrows point to the direction of growth. (C and G) Growth front of the nacre after treatment with chitinase. (D and H) Growth front of the nacre after treatment with proteinase K. Sample shown in A was plunged in liquid ethane and freeze-dried

. Fig, Histogram of frequency distribution of the organic matrix (A) and tablet (B) thicknesses at the growth front and mature regions. (A) Growth front: N = 59, average ± SD = 68 ± 29 nm; Mature region: N = 32, average ± SD = 15 ± 4 nm. (B) Growth front