6CSF:
reference: Structural basis for substrate binding and specificity of a sodium-alanine symporter AgcS., Ma J, Lei HT, Reyes FE, Sanchez-Martinez S, Sarhan MF, Hattne J, Gonen T, Proc Natl Acad Sci U S A. 2019 Jan 18. pii: 1806206116. doi:, 10.1073/pnas.1806206116. PMID: 30659158

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