Fir Cells from Moose Pellets (IMAGE) Michigan Technological University Caption Fir cells in a moose pellet under polarized light. Credit Grace Parikh/Michigan Tech Usage Restrictions Please credit the photographer. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.