2.2.15 已持有大型客车、重型牵引挂车、城市公交车、中型客车、大型货车、小型汽车、小型自动挡汽车准驾车型驾驶证的机动车驾驶人身体条件发生变化,不符合所持机动车驾驶证准驾车型的条件,但符合残疾人专用小型自动挡载客汽车准驾车型条件,可以直接申请变更为残疾人专用小型自动挡载客汽车驾驶证。

2.15 已持有大型客车、重型牵引挂车、城市公交车、中型客车、大型货车、小型汽车、小型自动挡汽车准驾车型驾驶证的机动车驾驶人身体条件发生变化，不符合所持机动车驾驶证准驾车型的条件，但符合残疾人专用小型自动挡载客汽车准驾车型条件，可以直接申请变更为残<|endoftext|> Some potential sources of contamination in a cell culture include: Contaminated reagents or media: If the reagents or media used in the cell culture are contaminated with microorganisms, it can lead to contamination of the cells. Contaminated equipment: If the equipment used for the cell culture, such as pipettes, incubators, or laminar flow hoods, are not properly sterilized, they can introduce contaminants into the culture. Cross-contamination: If cells from different cultures come into contact with each other, it can lead to cross-contamination and the growth of unwanted cells. Airborne contaminants: Airborne contaminants such as dust, bacteria, or fungi can settle onto the culture and contaminate it. Improper handling: If the cells are not handled properly, such as using improper aseptic technique or not changing gloves frequently, it can lead to contamination. Contaminated cell lines: Sometimes, cell lines can become contaminated with other cell lines or microorganisms. To prevent contamination in a cell culture, it is important to follow strict aseptic technique, use sterile reagents and media, regularly clean and sterilize equipment, and monitor the culture for signs of contamination.