From studies with monkeys, we know there are cells that respond only to faces.
Neurons are dynamic cells that respond and adapt to stimuli throughout their long postmitotic lives.
Additionally, most bivalves with or without eyes have light-sensitive cells that respond to shadows.
Grasshoppers, butterflies, and moths also have cells that respond to a range of secondary compounds.
Immune cells that respond to foreign particles douse the particles with toxins, among other tactics, to destroy them.
These observations suggest the utility of heterodimeric Fv chimeric receptors in creating cells that respond to monomeric antigen.
Using these cells we can both address the requirement for Disp1 in cells that express Shh, as well as in the cells that respond to Shh.
The agony of pain is probably experienced in a region called the anterior cingulate, where there are cells that respond to pain.
Interestingly, pre-motor regions have been shown to contain mirror neurons nerve cells that respond during execution and passive observation of actions40.
With an eye toward eventual medical treatments, companies have used them to produce neurons and beta cells that respond to insulin.
In fluctuating environments, cells that respond stochastically can out-compete those that sense environmental changes, and stochasticity may even have contributed to chromosomal gene order.
