Host Cell Protein Testing Market Size, Share & Trends Analysis Distribution by Service Type (HCP Assay Development, ELISA Reagent Customization, Anti-HCP Antibody Generation, Orthogonal Method Support, Product Stage (Preclinical, Clinical (Phase I, Phase II, Phase III), and Commercial), Technology (Enzyme-Linked Immunosorbent Assay (ELISA), 2D Gel Electrophoresis, Western Blotting, Liquid Chromatography – Mass Spectrometry (LC-MS/MS), Others), Application (Vaccines, Monoclonal Antibodies (mAbs), Enzymes, Gene Therapy Products, Biosimilars, Recombinant Proteins), Expression System (Insect Cells, Mammalian Cells, Microbial Cells), End-use (Academic & Research Institutions, Biopharmaceutical & Biotechnology Companies, Contract Development and Manufacturing Organizations (CDMOs), Contract Research Organizations (CROs)), and Segment Forecasts, 2025-2034