Fig 4. Evaluation of candidate markers in species identification of fiber standards.

(A) Evaluation of 24 candidate protein markers selected for fiber identification. None of them show satisfactory specificity and sensitivity across all fiber samples. (B) Evaluation of 65 candidate peptide markers selected for fiber qualification. Ten peptides (marked with a red star) show sufficient specificity and sensitivity across all fiber samples. Each line represents identification results of a specific protein/peptide across all samples. Fiber sample annotation is the same as described in Fig 1, and the appending number refers to the number of replicate of this sample.