Table 4 . Heterokaryon compatible (+) and incompatible (−) pairings with mean growth rates in parentheses (millimeters per day).

	hygR strains
	Dk80hygR (2211-22)	EU-21hygR (2211-12)	DK80 Δvic6-2 (2211-22)	DK80 Δvic7-2 (2211-22)
neoR strains
DK80neoR	+	−	+	+
(2211-22)	(8.0)	(<0.1)	(6.7)	(6.6)
EU-21neoR	−	+	−	−
(2211-12)	(<0.3)	(7.6)	(<0.1)	(<0.1)
EU-21 Δvic6-1	−	+	+	−
(2211-12)	(<0.3)	(6.7)	(7.0)	(<0.2)