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. 2019 Sep 4;6(9):190458. doi: 10.1098/rsos.190458

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© 2019 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 9. — (a) ATR-FTIR spectra of the different membranes obtained from the shells of A. psittacus by decalcification. (b) Relative intensities associated with the main organic components: proteins (amide I + amide II), polysaccharides and lipids (CH) of the different membranes; A–D are the groupings obtained with Tukey's method for a 95% confidence for the comparison of proteins, polysaccharides and lipids among the membranes analysed. BPP, peripheral membranes of the base plate; Cu, cuticle; Int, membranes of the lateral plate interiors; PRM, membranes covering the rostral margin of the paries; PT, membranes lining the primary tubes of the plate base; RAM, membranes covering the rostral alar margin.