white blood cells-leukocytes or leucocytes part of the immune system

and background basmati biology bioscience blast blood blymphocytes bodies bone cancer cell close closeup defence defending fight fights health healthy hematological hematology histopathology human illustration immune immunology ingredient isolated leucocytes leukocyte leukocytes leukosis lymphatic lymphocyte macro magnification microbiology microscope microscopic natural pathogens pathology protection science scientific system texture tlymphocyte view white