Placing control tissues in asymmetric locations is a deliberate and thoughtful strategy to prevent orientation errors during analysis. A TMA block and its resulting slides are symmetrical objects; they can easily be rotated 180 degrees or flipped. If the control tissues (e.g., a known positive tissue and a known negative tissue) were placed in symmetrical positions (like opposite corners), a simple rotation could swap their identities, leading to catastrophic misinterpretation of all experimental results on that slide. By deliberately placing them in asymmetric, non-mirror-image locations (e.g., positive control in the top-left quadrant A1, negative control in a middle-right position like D7), the researcher creates an inherent 'landmark' system. No matter how the slide is rotated, the unique, lopsided pattern of the controls allows for immediate and unambiguous orientation. This ensures that every experimental core is correctly identified according to the master grid map, safeguarding data integrity.

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Zambia

• Joseph Soko – 101 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies