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embryology pancreas third week amenorrhea external genitalia genital ducts gonads urethra bladder ureters kidneys urogenital system perineum biliary system gastrointestinal system head and neck pharyngeal pouches primary amenorrhea secondary amenorrhea hirsutism pcos pregnancy breast ovary cancer brca inflammation acute inflammation cytokines prostaglandins hiv aids gametogenesis implantation ovulation human biology second week gastrulation notochord villous system eighth week ectoderm mesoderm fetal period umbilical cord twinning placenta birth defects prenatal diagnosis body cavities respiratory system coelum diaphragm cardiovascular system heart arterial system venous system lymphatics fetal circulation skeletal system muscular system gastric carcinoma crohn's disease inflammatory bowel disease ibd tuberculosis fistula diarrhea creeping fat melanoma immunohistochemistry sox10 s100 hmb45 melan-a prame nevus sentinel braf cd117 obesity leptin insulin ghrelin syndrome monogenic polygenic diet exercise sleep weight loss weight pharyngeal appartus retrovirus haart antiretrovirals learning forgetting spaced repetition systems anki milk breastfeeding formula feeding ewing extraskeletal sarcoma hyperacute rejection renal transplant mesothelial hyperplasia mesothelioma solid pseudopapillary neoplasm spn paris system urine cytology thymus thymoma pilonidal sinus pilonidal disease pilonidal carcinoma gastric cancer h. pylori her2 pd-l1