Time series

Hello everyone.

First, thanks in advance for the help.

I am working on an in vitro study to determine the time stability of cells on a microscope slides. The experimental design is as follows:

Blood was collected from 10 individuals. This blood was incubated with 6 different concentrations of a compound known to induce a change in cells that will be quantified as "percent cells affected." Slides were made for each of these concentrations for each individual. Then, each slide was evaluated at time 0, 1 day, 2 days, 3 days, 7 days, 14 days, 21 days and 28 days. I am interested in determining if time has any influence on the number of cells affected. What is the best approach to analyze this dataset?