Luciferin glows in the dark and is found in fireflies, deep sea fish, etc. that use bioluminescence. This model comes with bonds that glow in the dark; only $9.95.
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Indigo Instruments has maintained a substantial inventory of genuine Cochranes of Oxford (Orbit) parts for 30+ years (scroll down to see "Skeletal (Orbit/Minit) and are compatible with every molecular model kit we have sold since day 1. This level of quality may appear expensive but no parts support from other vendors costs even more.