Light micrograph of the ciliate protozoan Paramecium sp., showing its macronucleus (deep pink). Ciliates possess two different types of nucleus; a small micronucleus (not visible here) & a larger macronucleus. The micronucleus contains the diploid set of chromosomes and is responsible for sexual reproduction, undergoing meiosis to give rise to gametic nuclei. The macronucleus is usually polyploid, containing several copies of each of the chromosomes. It deals with the metabolic & somatic cell functions & disintegrates during the early stages of sexual reproduction. Magnification: x160 at 6x4.5cm, x93 at 35mm size.

Photo website with Rights Managed and Royalty Free stock photos, images, illustrations and footage available for download immediately for commercial and editorial uses. Aflo is a leading independent supplier and producer of stock pictures and visual content. Search and find high quality images and video for design, print, web-use and publishing. Buy photos from our extensive collection of model released and property released sports images. Search some of the most beautiful travel and landscape pictures from our own photographers and license from our large collection of content, modern and archive, focusing on Japan. We provide free research. Register for personal account management and for full use of our Stock Photography website and start to download images now.