Experiment with Antbiotic Resistant (Green) and Susceptible (Black) Bacteria (video) University of Groningen Share Print E-Mail Loading video... Caption We see Staphylococci bacteria, which have been labelled with a green fluorescent protein, expressing a resistance gene for the antibiotic chloramphenicol. Next to them are black Streptococcus pneumoniae bacteria that do not have the resistance gene. In a medium containing the antibiotic, the green cells begin to grow and divide whereas the non-resistant black cells don't. After a time, individual black cells begin to divide and they even outgrow their green companions. Credit Sorg et al. / University of Groningen Usage Restrictions With credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.