Connective tissue (CT) is one of the four types of biological tissue that support, connect, or separate different types of tissues and organs in the body. The other three types are epithelial, muscle, and nervous tissue.
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RTR may refer to: 1  Remember The Ronin, The registered trademark (RTR) of the American paintball company Remember The Ronin.. 2  Roll Tide Roll, the chant of the University of Alabama's Crimson Tide. Remember The Ronin, The registered trademark (RTR) of the American paintball company Remember The Ronin.. 2  Roll Tide Roll, the chant of the University of Alabama's Crimson Tide. 3  Advanced and retracted tongue root (ATR and RTR), contrasting states of the root of the tongue during the pronunciation of vowels.