Table 1.

Variable Composition of Double-stained MYC/nebulin Ectopic Fibrils/Patches

MYC-positive	Rho-phalloidin–positive	c-α-actin–positive	Nebulin (NB2)-positive	Tropomyosin-positive	S-α-actinin–positive	Titin (Z1Z2)-positive	MHC-positive
100%	93%	67%	60%	37%	3%	0%	0%
(n = 210)	(n = 30)	(n = 30)	(n = 30)	(n = 30)	(n = 30)	(n = 30)	(n = 30)

Day 10 cultures expressing MYC/M171-M183 were double stained with anti-MYC and Rho-phalloidin, or with antibodies to other myofibrillar proteins. A total of 210 randomly selected MYC-positive fibrils/patches were examined, and the percentage that costained for the other myofibrillar proteins determined.