Teacher:In this task, you will be given sentences in which you have to recognize the name of the body cells. A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Although there might be several correct answers, you need to write one of them.
Teacher: Now, understand the problem? Solve this instance:  Important parameters are tumor site , depth of invasion , histological type and grade , pattern of invasion ( diffusely infiltrating versus expanding margin ) , degree of peritumoral lymphocytic infiltration , and tumor involvement of surgical margins and lymph nodes .
Student:
peritumoral lymphocytic