Sia-Gal link in Human and Avian/Swine surface proteins

Sia α(2,6) Gal  (Human)

Sia α(2,3) Gal (Avian and some Swine)

(made with Sweet, with an OH, not AcNH on sialic acid on C5)

(made with Sweet, with an OH, not AcNH on sialic acid on C5)