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Did you know that penicillin can be grown outside of a lab? This mold-based antibiotic can be grown as a science project using a slice of bread. Please note that these instructions should be used for experimentation only; when there is a medical need for penicillin, it should be obtained through a doctor. Making penicillin does require some scientific equipment, and it is very important to keep the area sterile while you are growing penicillin. Here’s how to make penicillin: