DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Color enhanced transmission electron micrograph of a section of reticulum in an adrenocortical cell of a human fetus of 27 weeks. This slightly oblique section passes tangential to three cisternae. In each, there are long loops and spirals consisting of multiple ribosomes aligned on the same molecule of messenger RNA.
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