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Fertilized perithecia from wild type (left panel/A) and ΔpalA (right panel/B) were allowed to develop for 7 days. The perithecia were squashed between a glass slide and a glass coverslip and examined with a transmitted light microscope. The wild type perithecia has generated ascospores (arrow) while the ΔpalA peirthecia is defective in ascospore formation. The arrow in the left panel points to an ascospore.
