Table 1.

Comparison of mechanical properties.

	N-R7-C (this study)	Native Dragline silk A. trifasciata	NT2RepCT	N1L(AQ)24NR3	Synthetic 192-mer	eTuSp1	NT-MaSp1s-CT	MaSp1 (WS-PSD-3x)	eMaSp1s
References	This study	64	9	13	73	41	30	36	42
Diameter (μm)	28 ± 7	~ 3	12 ± 2	20 ± 6	5.7 ± 1.3	–	92 ± 5	–	49 ± 7
Extensibility (%)	3 ± 1.5	17 ± 0.04	37 ± 5	54 ± 15	22 ± 8	17.5 ± 1.6	97 ± 2	18.3 ± 12.8	102 ± 24
Strength (MPa)	40 ± 14	890 ± 130	162 ± 8	308 ± 131	1,031 ± 111	78.3 ± 4.2	52.92	286.2 ± 137.7	282 ± 66
Toughness (MJ/m3)	3.9 ± 3.4	100 ± 40	45 ± 7	90 ± 29	114 ± 58	11.5 ± 0.8	3.56 ± 0.1	37.7 ± 28.8	144 ± 44
Young's modulus (GPa)	1.8 ± 0.7	11.6 ± 0.7	6 ± 0.8	5 ± 2	13.7 ± 3	2.4 ± 0.4	1.65 ± 0.3	8.4 ± 4.3	1.5 ± 0.3

The best examples of the mechanical properties for fibers spun from recent recombinant spidroins, as reported in the referenced articles. Data for N-R7-C is reported with the standard deviation for all recorded fibers (Fig. 8 and Supplementary Fig. S11).