Table 14.

The incomplete penetrance of the spinal cord phenotype in hmx3a^SU3 mutants is not due to genetic compensation

Embryo class	WT	hmx3aSU3 mutants	P value
Uninjected control	106 ± 2.44	94.5 ± 2.62	0.01+
Weaker phenotype	102.75 ± 2.27	96.8 ± 1.77	0.05+
Morphant-like	70.22 ± 3.76	74.0 ± 2.75	0.72^
All injected	80.23 ± 4.01	81.86 ± 2.78	0.74+

The spinal cord phenotypes of embryos (as assessed by slc17a6a/b expression) in the distinct phenotypic classes shown in Table 13 were analyzed on a compound microscope while blind to genotype. Values in columns 2 and 3 indicate the mean number of labelled cells ± SEM. Column 4 shows the P values from either a Wilcoxon-Mann-Whitney test (^, performed when data was not normally distributed) or from a type 2 Student’s t-test (⁺, performed when data was normally distributed and variances were equal) for the comparison of homozygous WT embryos to homozygous hmx3a^SU3 mutants for a particular classification (values on same row). All P values are rounded up to 2 decimal places. See Materials and Methods for more information on statistical tests. Statistically significant values are indicated in bold.