Characteristics of the Aragonitic Layer in Adult Oyster Shells, Crassostrea gigas: Structural Study of Myostracum including the Adductor Muscle Scar

Table 2

Secondary structure of the intracrystalline proteins of each layer in vivo: (a) Folia by fracturing in first, (b) Folia by fracturing in second, (c) Folia by fracturing in third, and (d) Folia and myostracum buried in folia.

Assignment	Band position (cm^−1)	(a)	(b)	(c)	(d)
α-helix	1647–1660	58.0	58.5	66.1	8.6
β-sheet	1615–1640	7.7	9.8	9.0	13.1
Turns	1661–1680	—	—	3.9	3.8
β-anti	1681–1692	34.3	31.7	21.0	74.5

Unit: area %.