TY - RPRT TI - Simple and robust two-layer matrix/sample preparation method for MALDI MS/MS analysis of peptides. AU - Jing Zheng AU - Nan Li AU - Marc Ridyard AU - Hui Dai AU - Stephen M Robbins AU - Liang Li DO - 10.1021/pr050157w UR - https://pubmed.ncbi.nlm.nih.gov/16212424/ ID - 16212424 ER -