The mother of Trayvon Martin testified on Friday that the screams for help heard on 911 calls on the night of her son's death came from the 17-year-old.

ANALYSIS: Testimony of Trayvon's Family Will Play on Jurors' Emotions

Sybrina Fulton took the stand this morning during the murder trial of George Zimmerman and listened to audio of the recording, afterward telling the jury that she recognized the voice contained on the tape as belonging to "Trayvon Benjamin Martin."

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