Differential interference contrast (DIC) light micrograph of biflagellated chlorophytes (Haematococcus pluvialis), a type of green algae. These algae turn ponds and bird baths red because they contain a high concentration of the antioxidant astaxanthin, a carotenoid. Magnification: x250 when printed 10 centimetres wide.
Model release not required. Property release not required.