Cervical cancer research. Fluorescence light micrograph of abnormal cells in the cervix. The non-blue colours represent cells that have infiltrated the mucous membrane cells of the cervix, indicating abnormal expansion or growth. This indicates pre-cancerous or cancerous tissue. The protein biomarkers highlighted here are CD3 (yellow), CD8 (red), PD1 (pink) and PDL1 (green). The blue colour represents cell nuclei. The intensity of each fluorescent signal indicates the amount of that particular protein present in the tissue sample. This image indicates the presence of different inflammatory cells and immune regulatory cells present in the cellular infiltrate.