In this task, you are given a paragraph (from a research paper) and your task is to classify each sentence of the paragraph (assume n sentence) into the following categories: Background, Purpose, Method, Finding/Contribution, or Other. Return the output in this format: 1 - category of sentence 1, 2 - category of sentence 2, ..., n - category of sentence n; where each number indicates the order of the sentence. The categories can be identified using the following questions: 
 Background: - Why is this problem important? - What relevant works have been done before? - What did the previous works miss? - What are the high-level research questions? - How might this help other researchers?
 Purpose: - What specific things do the researchers want to do? - What specific knowledge do the researchers want to know? - What specific hypothesis do the researchers want to test?
 Method: - How did the researchers do it or find it out? - What are the procedures and steps of this research?
 Finding/Contribution: - What did the researchers find out? Did the proposed methods work? - Did things behave as the researchers expected?
Other: put every text fragment that does not fit into any of the categories above here. Put a sentence here if its not in English, is not part of the article, contains numbers and dates, is a caption of a figure or a table, is a formatting error, or you are not sure about it.

Virus replicate inside prokaryotic and eukaryotic cells. Outside cells, they exist as independent particles (i.e. virions) generally composed of a protein shell (sometimes covered with a lipid bilayer) that contains their genetic material made of RNA or DNA. Virus genome replication and transcription are catalyzed by virally encoded polymerases. Although all these enzymes show some homology and share structural features and their catalytic mechanism, they also have important differences that reflect diverse virus replication strategies.
1 - background, 2 - background, 3 - background, 4 - finding, 5 - finding

BJORKSTRAND, E. AND K. UVN,~S-MOBERG. Central oxytocin increases food intake and daily weight gain in rats. PHYSIOL BEHAV 59(4/5) 947-952, 1996.--The present study was performed to investigate the effects of
1 - other, 2 - background, 3 - other, 4 - purpose

j o u r n a l h o m e p a g e : h t t p : / / w w w . j o u r n a l s. e l s e v i e r . c o m / j o u r n a l -o f -h o sp i t a l i t ya n d -t o u r i s m -m a n a g e m e n t.

1 - other, 2 - other, 3 - other

