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Table 1 Relative expression of sialic acid in avian tissues.

From: Characterization of influenza virus sialic acid receptors in minor poultry species

Species Age (Week) Trachea Lung Large intestine
   2,3 2,6 2,3 2,6 2,3 2,6
Duck 1 + - + + + -
  2 + - ++ + ++ +
  4 + - ++ + ++ +
Goose 1 + - + + + -
  2 + - + + ++ +
  4 + - + - + +
Pheasant 1 ++ + + + + +
  2 ++ + + + + +
  4 ++ + + + + +
Turkey 1 ++ + + + + -
  2 ++ + + + + -
  4 ++ ++ ++ ++ + -
Guinea fowl 1 + + + + + -
  2 + + + + + -
  4 + + + + + -
Quail 1 + + + + + -
  2 + + + + + -
  4 + + + + + -
  1. - no expression, + minimal expression, ++ moderate-high expression