mammalian phenotype
        immune system phenotype
                abnormal immune system morphology
                        abnormal immune system organ morphology
                                abnormal lymph node morphology
                                        abnormal abdominal lymph node morphology +
                                        abnormal afferent lymphatic vessel morphology
                                        abnormal efferent lymphatic vessel morphology
                                        abnormal lymph node cell ratio
                                        abnormal lymph node cortex morphology [MP:0002343] (67 genotypes, 83 annotations)
                                                abnormal lymph node B cell domain morphology +
                                                abnormal lymph node T cell domain morphology
                                        abnormal lymph node medulla morphology +
                                        abnormal lymph node number +
                                        abnormal lymph node size +
                                        abnormal lymph node trabecula morphology
                                        abnormal peripheral lymph node morphology +
                                        absent lymph nodes

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