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Table 2 Expression of α- and β-keratins during embryonic chicken development

From: Dynamic evolution of the alpha (α) and beta (β) keratins has accompanied integument diversification and the adaptation of birds into novel lifestyles

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[↑]
  1. 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.
  2. *Direction of selection is indicated in brackets (↑: Up-regulated; ↓: Down-regulated) after each copy number and refers to the first sample for each comparison.