Personalized cancer vaccine made in plants

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Personalized cancer vaccine made in plants. This work deals with a

cancer of the immune system, called follicular B cell lymphoma. An important characteristic of this cancer is that each case expresses a unique antigen, reflecting its development from a single immune system cell. The goal is to make a vaccine that targets this particular antigen. Here, they show that they can do in a plant system -- which is both faster and cheaper than animal systems previously tried. The resulting vaccines do elicit an immune response in [most of] the patients, though no therapeutic benefit was seen in this small early study. The work is of note both for the special approach of making a personalized vaccine, and for the broader issue of making vaccines in plants.
21) Besides being necessary for the activation of the main gastric digestive enzyme, how is HCl directly involved in digestion?
22) How are the gastric mucosa protected from the acidic pH of the stomach?
23) What digestive enzyme acts within the stomach? Which type of food does it digest? What cells produce that enzyme?
25) What are the three parts of the small intestine?
26) Which of carbohydrates, fats or proteins have already undergone chemical digestion upon reaching the pylorus (upon exiting the stomach)?
27) What substance produced in the liver is involved in digestion in the small intestine? What is the role of this substance in the digestive process?
28) What is the adnexal organ of the digestive system in which bile is stored? How does this organ react to the ingestion foods high in fat?
29) What are the digestive functions of the liver?
30) In addition to the liver, what other adnexal gland of the digestive system releases substances involved in extracellular digestion into the duodenum?