Leia o texto para responder à questão abaixo. Cell culture experiments are widely used in biomedical research, regenerative medicine, and biotechnological production. Due to restri

Leia o texto para responder à questão abaixo.

Cell culture experiments are widely used in biomedical research, regenerative medicine, and biotechnological production. Due to restrictions on the use of laboratory animals by animal protection laws and the strict implementation of the 3Rs (Replacement, Reduction, and Refinement) formulated by William Russell and Rex Burch to improve the welfare of animals, it can be expected that the general use of cell lines will further increase during the next years to substitute animal-based research. However, it should be noted that cell culture experiments, if not properly conducted, are prone to errors. Therefore, it is essential that cell culture studies are performed with good cell culture practice (GCCP) to assure the reproducibility of in vitro experimentation.

In particular, inter- and intra-specific cross-contamination and cell misidentification, genetic drift, contamination with bacteria, fungi, yeast, viruses, or chemicals, and lack of quality control testing are widespread fatal cell culture problems that contaminate the literature with false and irreproducible results. Rough estimates suggest that the number of published papers that used problematic cell lines is about 16.1%. Moreover, the International Cell Line Authentication Committee (ICLAC) lists 576 misidentified or cross-contaminated cell lines in its latest register released in June 2021.

(Weiskirchen S, Schröder SK, Buhl EM, Weiskirchen R. A Beginner’s Guide to Cell Culture:

Practical Advice for Preventing Needless Problems. Cells. 2023 Feb 21;12(5):682. doi: 10.3390/cells12050682.

PMID: 36899818; PMCID: PMC10000895. www.ncbi.nlm.nih.gov/pmc/articles/PMC10000895/. Adaptado)

According to the second paragraph, an example of contaminant that may be present during in vitro cell culture is: