Lateral Growth of Type I Collagen Fibrils (IMAGE) World Scientific Caption (a) From the planar configuration of the layering to a helicoidal one, the strong lines are triple helices in double-twist, and (b) quadrant of a phyllotactic pattern showing the increase of the spacing between grain boundaries when moving away from the center. Credit World Scientific Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.