Fig 1 -

Schemes of cytoneme-mediated cell signaling based on experimental evidence: (A) Type 1: Receiving cells emit cytonemes to collect the morphogen from producing cells. (B) Type 2: Producing cells emit cytonemes to deliver the morphogen to receiving cells. (C) Type 3: Both producing and receiving cells emit cytonemes to deliver and collet the morphogen respectively. (D) Frame of reference used to develop the mathematical equations. (E) Schematic representation of the cytoneme triangular dynamics. (F) Schematic representation of the cytoneme trapezoidal dynamics.