What type of protein allows cells to communicate with each other and can cause one cell to respond to a message sent by another cell?

What is the difference between drug misuse and drug abuse?

Health is as much a social as a biological concern. analyze whether or not healthcare is equally accessible to people belonging to all strata of american society. what steps has the us government taken to address this problem? suggest one measure that can lead to a comprehensive solution to this problem.

Is tea good for you? if so what type of tea is good for you? and how much should i drink before it is a threat to my health?