Molecular basis for prey relocation in viperid snakes

Table 2 Prey discrimination is associated with non-enzymatic fractions.

Fraction	NE	E	t	df
Peak I	67.4 (11.9) 51	68.7 (12.3) 49 (5.3)	0.09 0.22	16
Peak IIa	72.9 (15.6) 50	59.0 (12.7) 50 (7.0)	0.70 0.01	10
Peak IIb	73.3 (18.4) 49	69.2 (15.3) 51 (4.3)	0.22 0.25	9
Peak III	25.3 (5.1) 32	53.6 (7.7) 68 (3.2)	4.24 5.78	10
Small peptide peaks (combined)	33.0 (7.7) 49	52.7 (24.6) 51 (11.7)	0.79 0.12	8

Mean number of tongue flicks and mean percent (lower values) tongue flicks (s.e.m.) directed at non-envenomated (NE) and envenomated (E) mice by Crotalus atrox when mice were envenomated using BioGel Peaks I, IIa, IIb, III or combined peptide peaks. Single-sample t-test was conducted on mean percentages in which mean percent tongue flicks to E mice were compared with 50%, the value expected under the null hypothesis. Because the two means within each paired comparison are not independent, the same t-value but with the opposite sign would be obtained for each mean. For raw data, see Additional file 1, Table S1. ** P < 0.01.

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