In this task, you are given a sentence from the research paper and your task is to classify the given sentence into the following categories: Background (Why is this problem important? What relevant works have been created before? What is still missing in the previous works? What are the high-level research questions? How might this help other research or researchers?), Purpose (What specific things do the researchers want to do? What specific knowledge do the researchers want to gain? What specific hypothesis do the researchers want to test?), Method (How did the researchers do the work or find what they sought? What are the procedures and steps of the research?), or Finding (What did the researchers find out? Did the proposed methods work? Did the thing behave as the researchers expected?). 

the causative agent of Chagas ' disease.
background

Attachment is followed by a redistribution or capping of virus particles on the cell surface which may play a role in the uptake process.
background

Madin-Darby bovine kidney cells stably expressing microtubule-associated protein 1 light chain 3B ( LC3B ) with green fluorescent protein ( GFP ) ( GFP-LC3-MDBK cells ) and autophagy-deficient MDBKs ( shBCN1-MDBK Yulong Zhou and Yachao Ren have contributed equally to this work.

finding