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The four sentences (labelled 1, 2, 3, 4) below, when properly sequenced would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:
1. In the central nervous systems of other animal species, such a comprehensive regeneration of neurons has not yet been proven beyond doubt.
2. Biologists from the University of Bayreuth have discovered a uniquely rapid form of regeneration in injured neurons and their function in the central nervous system of zebrafish.
3. They studied the Mauthner cells, which are solely responsible for the escape behaviour of the fish, and previously regarded as incapable of regeneration.
4. However, their ability to regenerate crucially depends on the location of the injury.
Correct Answer: 2341
A preliminary read gives us a crude idea about the subject: regeneration of neurons in zebrafish. The discovery is introduced in Statement 2 {'a uniquely rapid form of regeneration in injured neurons and their function in the central nervous system of zebrafish.'} Additional information is presented in statement 3 {what kind of cells were studied? how has the status quo changed?}. Statement 4 presents further clarification concerning the zebrafish {location of the injury is an essential variable} and Statement 1 transitions into an opinion about the regeneration phenomena in other animal species. Hence, arrangement 2341 forms a coherent paragraph.
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