The spike proteins of enveloped viruses, such as influenza HA, share which structural feature with fibrous proteins?a) a Gly-Ala/Ser repeat that leads to a collagen-like triple helixb) a heptad repeat of hydrophobic amino acids that leads to a collagen-like triple helixc) viral spike proteins share no structural features with fibrous proteinsd) a heptad repeat of hydrophobic amino acids that leads to a three-stranded, coiled-coil structuree) a Gly-Pro-HydroxyPro repeat that leads to a collagen-like triple helix

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