Table 1.

Characteristics of muscle fiber QTL in combined analyses of the F₂ and F₃₄ intercrosses derived from the LG/J and SM/J strains

Chr	Thr	Level	Start Mb	End Mb	Size Mb	Trait	Locus
1	C	0.1	67.6	70.7	3.1	% type I
1	C	0.1	193.9	194.3	0.4	% type I, CSA2A
2	C	0.1	92.4	104.8	12.4	% type I
2	C	0.05	139.6	145.6	6.0	% type I
2	G	0.01	158.8	162.5	3.7	% type I	Mfq4 (SM)
3	G	0.05	33.6	40.0	6.4	CSA1, CSA2A	Mfq5 (SM)
4	G	0.05	57.7	62.7	5.0	% type I	Mfq6 (LG)
4	C	0.05	103.9	106.1	2.2	% type I
6	C	0.05	81.9	84.1	2.2	CSAIIA
6	C	0.01	110.8	116.0	5.2	CSA1, CSA2A	Mfq2* (LG)
7	C	0.05	138.4	140.0	1.6	% type I
8	C	0.1	7.4	12.4	5.0	% type I
8	C	0.05	89.0	92.4	3.4	total
8	C	0.01	121.9	128.6	6.7	total
10	G	0.1	120.7	121.3	0.6	% type I
11	C	0.1	12.4	17.2	4.8	CSAIIA
11	C	0.1	19.1	23.1	4.0	CSAIIA
11	G	0.01	28.0	31.5	3.5	CSA1, CSA2A	Mfq3* (LG)
11	C	0.1	62.5	64.2	1.7	% type I
11	C	0.1	70.6	76.2	5.6	% type I
12	C	0.1	27.6	29.3	1.7	CSA1
13	C	0.01	5.3	9.9	4.6	% type I
13	C	0.05	71.5	74.0	2.5	CSAIIA
14	C	0.05	93.6	102.3	8.7	CSAIIA
15	C	0.1	12.1	20.3	8.2	TOTAL
16	C	0.05	68.9	75.1	6.2	CSA1, CSA2A
X	C	0.01	11.8	52.5	40.7	total

^*Refined previously identified QTL in the LG/J and SM/J F₂ intercross (47).

QTL, quantitative trait locus; C, chromosome-wide threshold; G, genome-wide threshold. “Level,” level of significance; Start, genomic positions based on GRCm38.p3; LG, increasing allele is LG/J; SM, increasing allele is SM/J.