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. 2017 Jan 24;7:41270. doi: 10.1038/srep41270

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(A) Analysis of 4 eluted protein fractions (#1–4) by UV absorption after passing the saliva through the purification column. (B) Analysis of eluted protein fractions (#1–4) by SDS-PAGE. Only the #4 eluted fraction contains a protein with a molecular weight of 13.5 kD which matches the molecular weight of mature hNGF.