What is it?

An Arabidopsis seedling expressing Green Fluorescent Protein (GFP) targeted to the endoplasmic reticulum. The red fluorescence is caused by chlorophyll autofluorescence, the green is due to GFP fluorescence. Photo by Amie Scott and Nina S. Allen, Department of The Botany Department, North Carolina State University. For more photos, visit the page on Exploring Video Microscopy from the Cellular and Molecular Imaging Facility at NCSU.