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Create an impressive display and teaching model. This Proview model shows the DNA double helix with up to 15 base pair layers and illustrates more than one turn of the double helix. Every atom is shown, colour coded, with the correct bonding angles. Pupils can make up the sub assemblies: Thymine-Adenine; Cytosine-Guanine, sugar rings and phosphate groups which can then be brought together to make the finished model. The model hangs between two plates from clear strings and can be supported by an optional display stand. Comes with comprehensive instructions and a worksheet examining the structure of DNA and the mechanism of transcription. Also available as a fully assembled model if required (Please contact us for details). Contents: 750 atoms, 850 bonding straws, Support plates for hanging, Assembly instructions and worksheet. Height: 85cm (2.8ft) Width: 40cm (1.3ft)