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    Teenage friends using smart phones — Stock Photo
    Teenage friends using smart phones
    Scientist holding multi-well plate with growth medium. — Stock Photo
    Scientist holding multi-well plate with growth medium.
    Smiling teenage boy with headphones using mp3 player on urban sidewalk — Stock Photo
    Smiling teenage boy with headphones using mp3 player on urban sidewalk
    Casual business people working in open office — Stock Photo
    Casual business people working in open office
    Lymphoma cancer cell — Stock Photo
    Lymphoma cancer cell
    Enthusiastic friends taking selfie on double-decker bus with London Eye in background — Stock Photo
    Enthusiastic friends taking selfie on double-decker bus with London Eye in background
    Laughing friends texting with cell phone — Stock Photo
    Laughing friends texting with cell phone
    High school students with smart phones hanging out — Stock Photo
    High school students with smart phones hanging out
    Young friends texting with cell phone, enjoying sunny summer picnic — Stock Photo
    Young friends texting with cell phone, enjoying sunny summer picnic
    Teenage girls using cell phone and digital tablets — Stock Photo
    Teenage girls using cell phone and digital tablets
    Enthusiastic friends taking selfie on bus — Stock Photo
    Enthusiastic friends taking selfie on bus
    High school girl friends using smart phone — Stock Photo
    High school girl friends using smart phone
    Female friends texting with cell phones in cafe — Stock Photo
    Female friends texting with cell phones in cafe
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.
    Casual businessman texting with cell phone in office — Stock Photo
    Casual businessman texting with cell phone in office
    Portrait upset young woman with smart phone in cafe — Stock Photo
    Portrait upset young woman with smart phone in cafe
    Young woman texting with smart phone in window — Stock Photo
    Young woman texting with smart phone in window
    Woman texting on bench outdoors — Stock Photo
    Woman texting on bench outdoors
    Smiling young woman commuting with bicycle, talking on cell phone on sunny urban street — Stock Photo
    Smiling young woman commuting with bicycle, talking on cell phone on sunny urban street
    Tween girl texting with smart phone — Stock Photo
    Tween girl texting with smart phone
    Friends texting at modern cafe window — Stock Photo
    Friends texting at modern cafe window
    Woman listening to headphones on sofa — Stock Photo
    Woman listening to headphones on sofa
    Teenage girl laying and texting with cell phone — Stock Photo
    Teenage girl laying and texting with cell phone
    Happy high school students using smart phone — Stock Photo
    Happy high school students using smart phone
    Smiling teenage boy texting with smart phone — Stock Photo
    Smiling teenage boy texting with smart phone
    Young couple taking selfie at amusement park — Stock Photo
    Young couple taking selfie at amusement park
    Enthusiastic friends being photographed on double-decker bus — Stock Photo
    Enthusiastic friends being photographed on double-decker bus
    Young woman with smart phone on urban sidewalk — Stock Photo
    Young woman with smart phone on urban sidewalk
    Portrait enthusiastic young woman on bicycle texting on city street — Stock Photo
    Portrait enthusiastic young woman on bicycle texting on city street
    Smiling man with eyeglasses talking on cell phone on bus — Stock Photo
    Smiling man with eyeglasses talking on cell phone on bus
    Female researcher using light microscope for examining stem cells in culture jar. — Stock Photo
    Female researcher using light microscope for examining stem cells in culture jar.
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Man using camera phone in camper van — Stock Photo
    Man using camera phone in camper van
    High school students hanging out — Stock Photo
    High school students hanging out
    Smiling woman texting with cell phone in cafe — Stock Photo
    Smiling woman texting with cell phone in cafe
    Young woman posing for a selfie at sidewalk cafe — Stock Photo
    Young woman posing for a selfie at sidewalk cafe
    Young adult friends using smart phones at cafe table — Stock Photo
    Young adult friends using smart phones at cafe table
    Man listening to headphones outdoors — Stock Photo
    Man listening to headphones outdoors
    Young man using smart phone on living room sofa — Stock Photo
    Young man using smart phone on living room sofa
    Digital illustration of cell in early stage of programmed cell death. — Stock Photo
    Digital illustration of cell in early stage of programmed cell death.
    Female friends drinking coffee and using cell phone in cafe — Stock Photo
    Female friends drinking coffee and using cell phone in cafe