Educational figure illustrating hematological abnormalities in a murine model of Prkab1 deficiency, serving as a surrogate for studying human hemolytic anemia and microcytosis. Panels A-F present dot plots of hematological indices for wild-type (Prkab1+/+) and deficient (Prkab1tm1b/tm1b) mice, showing significant reductions in hemoglobin (A), hematocrit (B), and mean corpuscular volume (E), with a concomitant increase in red blood cell distribution width (F), indicating microcytic anemia with anisocytosis. Panel G contains high-resolution Scanning Electron Microscopy (SEM) images comparing erythrocyte morphology; wild-type cells show standard biconcave discocyte morphology, whereas Prkab1-deficient cells exhibit poikilocytosis with numerous abnormal forms, including acanthocytes, schistocytes, and echinocytes with irregular surface protrusions. Panel H displays an osmotic resistance curve, where Prkab1-deficient erythrocytes demonstrate a left-ward shift, signifying increased osmotic resistance (delayed hemolysis) compared to wild-type controls. The inset confirms a lower NaCl percentage required for 50% hemolysis in deficient cells, indicating altered membrane stability.

This composite clinical photograph illustrates common physical examination findings associated with severe anemia. The left panel shows the bilateral palms of a patient, demonstrating marked palmar pallor. The skin on the palms and creases appears significantly lighter and lacks the typical pinkish hue of healthy vascularized tissue, suggesting reduced hemoglobin concentration. The right panel is a close-up of the patient's face with the lower eyelid retracted to reveal the palpebral conjunctiva. Instead of the normal vibrant red or pink color, the conjunctiva exhibits conjunctival pallor, appearing whitish or very pale pink. These visual signs are critical diagnostic markers in hematology and general medicine for identifying systemic conditions such as iron-deficiency anemia or other forms of chronic blood loss. The image serves as a teaching tool for medical students and clinicians to recognize mucosal and cutaneous indicators of decreased red blood cell mass or oxygen-carrying capacity.

This composite educational image illustrates the hematopoietic and morphological effects of Stk40 knockout (KO) in mouse embryos. (a-d) Scatter and bar graphs display hematological indices: the KO group shows a significant reduction in hematocrit (HCT), red blood cell (RBC) count, and hemoglobin (Hb) concentration, while erythropoietin (Epo) levels are significantly elevated compared to wild-type (WT) and heterozygous (Het) controls. (e) Comparative clinical photographs of E14.5 embryos show that the Stk40 KO embryo exhibits severe subcutaneous edema (white arrowheads) and a diminished fetal liver shadow (black arrows) relative to the WT. (f) Macroscopic images of harvested fetal livers demonstrate marked hypoplasia in the KO liver compared to the WT. (g-j) Quantitative analysis and flow cytometry data show a decrease in total fetal liver cellularity and absolute numbers of Ter119+ erythroid cells in KO embryos, indicating impaired definitive erythropoiesis. Collectively, the data demonstrate that Stk40 deficiency leads to fetal anemia, edema, and hepatic hematopoietic defects.