Table 1.

Summary of modifier loci for the vl mutation (Modvl)

Cross	QTL	Chromosome (cM)	Peak marker	LOD	95% C.I., cM	Phenotype	High allele	Mode of inheritance
B6	Modvl1	5 (44)	D5Mit309	3.7	38–50	Spina bifida	C3H	Dominant
CAST/Ei	Modvl2	1 (26)	D1Mit236	3.3	0–36	Spina bifida	C3H	Additive
MOLF/Ei	Modvl3	4 (51)	D4Mit168	4.2	45–61	Cataract	MOLF	Additive