... theseptal nacreous layer of Nautilus macromphalus L.(Mollusca, Cephalopoda). Zoology 109, 85–95.33 Zhao H, Samata T, Takakura D, Hashimoto R,Miyazaki Y, Nozawa T & Hikita Y (2003) Organicmatrix ... Nagakura T, Ohkubo T, Sakagu-chi K, Tanaka M, Nakashima K & Takahashi T (1997)Structure of mollusc shell framework proteins. Nature387, 563–564.3 Suzuki M, Saruwatari K, Kogure T, Yamamoto ... resultinghydrolysate was analyzed on an HP 1090 Aminoquant(Hewlett-Packard, Palo Alto, CA, USA) [49] by an auto-mated two-step precolumn derivatization with O-phthalal-dehyde for primary and N-(9-fluorenyl)methoxycarbonylfor...