The possible mix-up happened at the Utrecht University Medical Centre during a process known as ICSI, or intra-cytoplasmic sperm injection, wherein an individual sperm is injected directly into an egg cell to create a fertilized egg for transfer. While the pipette used to inject the individual sperm into eggs was changed out between each individual procedure, the lab technician performing the procedure forgot to change out the rubber top on the pipette between procedures. The pipette in question also utilized a rubber top that did not, per protocol, have a filter in it.
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