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41.6 MB (4.4 MB compressed)
3480 x 4175 pixels
29.5 x 35.3 cm ⏐ 11.6 x 13.9 in (300dpi)
HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY HANS-ULRICH OSTERWALDER / SCIENCE PHOTO LIBRARY
Recombinant DNA. Illustration of the DNA molecule (Deoxyribonucleic Acid, showing a recombined fragment. DNA carries the inherited instructions of a living organism. Here, a segment of DNA (white, foreground) is joined to, and recombined with, a larger segment of DNA (blue, background). Recombination is used in genetic engineering to incorporate a gene sequence into a DNA strand. The DNA molecule is composed of two strands of atoms twisted into a helical shape. Each strand consists of an outer sugar-phosphate backbone (blue, white) from which nucleotide bases project and link up. The sequence of bases forms the genetic code.
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