Small modification of the node, reached by the integration of other different sensing units, such as accelerometer or sensors for measuring temperature, humidity, pressure, etc., within the node's layout, allows the mutuation
of its functioning according to the direct needs of the WSN.
Over a pet's lifetime, inflammatory events cause increased cell division and mutuation
. Because the immune response to these mutuated cells peaks at puberty and gradually decreases with age, most tumors occur in dogs and cats at least six years old.