TABLE 1.

XPS characterization of different elements and components of native spider dragline and spider dragline after an ether wash.

% (Standard deviation)	C 1s C-H	C 1s C = O	C 1s C-O	N 1s	O 1s	Na 1s	P 2p	S 2p	Ca 2p
Native dragline	60.1 (6.3)	6.8 (2.3)	16.0 (2.5)	2.8 (1.4)	8.8 (2.7)	1.2 (0.7)	0.68 (0.06)	0.53 (0.16)	0.75 (0.45)
Washed dragline	50.1 (2.6)	8.2 (2.1)	16.3 (3.2)	2.4 (0.1)	13.5 (3.7)	1.4 (0.5)	0.48 (0.25)	0.74 (0.08)	1.0 (0.53)

Numbers in parentheses are standard deviations in results obtained three different measurement positions.