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Which amino acids have polar neutral side chains?

Asparagine, cysteine, glutamine, serine, threonine

Asparagine

Asn, N

Cysteine

Cys, C

Glutamine

Gln, Q

Serine

Ser, S

Threonine

Thr, T

What are the structural features of cysteine?

The --HS group can deprotonate, and play important role in catalysis, or can increase rigidity through crosslinking