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In this phenomenon-driven activity, students investigate how cells are signaled to make melanin and explain how mutations in melanin pathway proteins affect the coat color of various organisms.

This activity explores images of the bobtail squid, which serve as phenomena for learning about symbiosis and interspecies interactions.

This animation shows how the cancer treatment Gleevec inhibits the cancer-causing protein BCR-ABL.

This video provides a demonstration of bioluminescent bacteria glowing in the dark.

This animation explores the LUX operon, a set of five genes that are involved in bacterial bioluminescence.

This animation shows how the drug Prialt suppresses signals from the nervous system, which can paralyze certain organisms.

This animation shows how cone snail toxins cause paralysis by blocking signal transmission at the synapse between neuron and muscle.

This video provides a demonstration of how nerve-muscle connectivity is measured.

This animation shows how varying concentrations of a signaling molecule activate different transcription factors to determine cell fate.

This animation shows how neurons send and receive signals to communicate with one another at contact points called synapses.

This video shows real footage of a cytotoxic T cell killing a cell infected by a pathogen.

This animation shows how a cell infected by a virus signals cytotoxic T cells to destroy itself.