Table 2.

Expression of α- and β-keratins during embryonic chicken development

Sample comparisons (Tissue/embryonic day of development)	Number of differentially expressed α- and β-keratins
	Type I α-keratins*	Type II α-keratins*	Keratinocyte β-keratins*	Scale β-keratins*	Claw β-keratins*	Feather β-keratins*
DF8/DF17	11[↓]	2[↑]; 7[↓]	10[↓]	9[↓]	12[↓]	67[↓]
DF8/DF19	11[↓]	1[↑]; 8[↓]	9[↓]	5[↓]	8[↓]	61[↓]
DF17/DF19	2[↑]	0	3[↑]	8[↑]	10[↑]	67[↑]
DF17/WF17	5[↓]	1[↓]	2[↓]	7[↓]	0	3[↓]
DF19/WF19	1[↑]; 1[↓]	3[↑]; 1[↓]	0	8[↓]	8[↓]	5[↓]
SC8/DF8	1[↑]; 1[↓]	3[↑]; 1[↓]	0	2[↑]	0	13[↑]; 1[↓]
SC8/SC17	1[↑]; 12[↓]	1[↑]; 10[↓]	10[↓]	9[↓]	12[↓]	70[↓]
SC8/SC19	1[↑]; 13[↓]	1[↑]; 8[↓]	10[↓]	9[↓]	12[↓]	65[↓]
SC17/DF17	4[↑]; 2[↓]	6[↑]	6[↑]; 1[↓]	9[↑]	11[↑]	17[↑]; 8[↓]
SC17/SC19	1[↑]; 1[↓]	2[↑]	4[↑]	3[↑]	1[↑]	35[↑]
SC17/WF17	4[↑]; 1[↓]	6[↑]; 1[↓]	9[↑]; 1[↓]	4[↑]; 4[↓]	12[↑]	17[↑]; 21[↓]
SC19/DF19	7[↑]; 1[↓]	5[↑]	7[↑]; 2[↓]	9[↑]	11[↑]	26[↑]
SC19/WF19	6[↑]; 1[↓]	4[↑]	4[↑]; 3[↓]	4[↑]	10[↑]	3[↑]; 1[↓]
WF17/WF19	1[↑]	0	1[↑]	0	0	5[↑]

Number of differentially expressed α- and β-keratins during embryonic chicken development for 14 sample comparisons with a p-value cutoff of 0.05 and a fold change cutoff of 2.0. DF, dorsal feather; WF, wing feather; SC, scale.

*Direction of selection is indicated in brackets (↑: Up-regulated; ↓: Down-regulated) after each copy number and refers to the first sample for each comparison.