Millonig Phosphate Buffer is widely used in biological and medical research for maintaining stable pH conditions during experiments. It is particularly effective in histology and cytology for tissue fixation and staining processes, ensuring optimal preservation of cellular structures. The buffer is also utilized in immunohistochemistry to prepare samples for antibody labeling, enhancing the accuracy of microscopic analysis. Additionally, it serves as a reliable medium for enzyme activity assays, where precise pH control is critical for consistent results. Its compatibility with various biological specimens makes it a versatile choice in laboratory settings.