as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
describe the functions of the endoplasmic reticulum.
user
the endoplasmic reticulum (er) is a network of membranes with functions in both protein synthesis and lipid metabolism. it is involved in the folding and modification of proteins and plays a role in the assembly of membrane proteins. it is also responsible for lipid metabolism, including the formation of lipids and their transport throughout the cell. it also serves as a storage organelle for calcium ions.
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