Table 2. Percent multiple innervation in thy1-YFP-lineH EOM muscles during postnatal development.

Numbers of multiply innervated ‘en plaque’-type NMJs were counted in SR, SO, LR, and LPS muscles throughout development. Each percentage represents the percent of multiply innervated synapses (±SD). N = the number of muscles analyzed per age; n = the total number of NMJs analyzed per age; ND – not determined. Tukey-Kramer tests were performed on data obtained from all age-matched muscles. For P21 LPS muscles, data was compared against all EOMs at P14. All statistically significant data sets are highlighted with asterisks and p values. For comparison with rates of synapse elimination in somite-derived muscles in thy1:yfp-lineH mice see Keller-Peck et al. 2001.

EOM muscle	% Multiple innervation at various postnatal ages
	P5	P7	P11	P14	P21	P56
Superior Rectus (SR) muscle	100% (N=2, n=19)	79.5 ± 9.2% (N=11, n=319)	4.8 ± 3.4% (N=7, n=243)	2.2 ± 2.8% (N=12, n=269)	ND	1.0± 1.0% (N=9, n=121)
Superior Oblique (SO) muscle	100% (N=1, n=8)	77.6 ± 6.7% (N=7, n=175)	6.9 ± 1.4% (N=7, n=243)	7.5 ± 3.7% (N=12, n=269)	ND	ND
Lateral Rectus (LR) muscle	ND	84.8 ± 10.5% (N=5, n=75)	7.7 ± 4.4% (N=7, n=243)	3.8 ± 3.6% (N=12, n=269)	ND	ND
Levator Palpebrae Superioris (LPS) muscle	100% (N=1, n=5) Not statistically different than P5 SR or SO muscles	87.0 ± 7.7% (N=7, n=120) Not statistically different than P7 SR, SO, or LR muscles	45.1 ± 4.1% (N=8, n=151) *p<0.0001 vs P11 SR, SO and LR muscles	42.7 ± 6.6% (N=6, n=106) *p<0.0002 vs P14 SR, SO and LR muscles	22.1 ± 9.1% (N=5, n=103) *p<0.004 vs P14 SR, SO, LR, and LPS muscles	7.3± 2.5% (N=8, n=80) *p<0.05 vs P56 SR muscle