Studies of isolated animal cells mixed together randomly and then placed in culture dishes have shown that they sort themselves out according to the types of membrane proteins they express.The figure below shows an example of this sorting-out process. 
Explain the molecular basis for how cells sort themselves out and form attachments to one another in producing the end product shown.
Definitions:
Right of Disaffirmation
A legal right allowing minors to void contracts they have entered into, based on their incapacity to fully understand the terms.
Ratified
Formally approved or confirmed, often in the context of treaties, contracts, or legislative acts.
Promissory Note
A written, legally binding document in which one party promises to pay another a definite sum of money either on demand or at a fixed future date.
Alcohol-Related Incapacity
A state of being unable to function or make decisions due to excessive consumption of alcohol.
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