Evolutionary patterns at the RNase based gametophytic self - incompatibility system in two divergent Rosaceae groups (Maloideae and Prunus)

Table 1 Accessible Surface Area (ASA) and Molecular Surface Area (MolSurf)

Dataset	Site category	N	ASA		MolSurf
			Mean	Exposed surface	Mean	Exposed surface
Maloideae D69	NPSS	164	44,80	67.0%	44,58	72.1%
	PSS	36	100,45	33.0%	78,63	27.9%
Maloideae D104	NPSS	122	49.77	70.9%	47.46	75.0%
	PSS	25	99.56	29.1%	77.38	25.0%
Prunus*	NPSS	131	51,74	77.9%	48,37	80.4%
	PSS	20	96,39	22.1%	77,39	19.6%
Solanaceae*	NPSS	114	43.75	79.9%	41.90	80.6%
	PSS	18	69.56	20.1%	64.05	19.4%

D69 - the 69 sequence dataset (complete sequences); D104 the 104 sequence dataset. NPSS - non-positively selected amino acid sites; PSS - positively selected amino acid sites. N - number of amino acid sites analysed. * - the positively selected amino acid sites used in these calculations are those identified in Vieira et al.[12].

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