In this task, you will be given sentences in which you have to recognize the name of the body cells. A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Although there might be several correct answers, you need to write one of them. 
 input :  Sickle cell disease : continuous arterial spin - labeling perfusion MR imaging in children .
detectable_format:multiple_sections keywords:existence detectable_content:number_placeholders length_constraints:nth_paragraph_first_word keywords:letter_frequency keywords:forbidden_words change_case:capital_word_frequency
Section
heart
falling
less than
e
falling
less than
Make sure to include at least 3 sections marking the beginning of each section with 'Section X' The response must include the keywords heart make sure it contains at least 1 placeholders represented by square brackets, such as [name] Write exactly 2 paragraphs each separated with two new lines answering this instruction. The first paragraph must start with "falling" The letter e should show up less than 5 times Do not include the keywords: falling Respond with less than 4 words be in all capital letters