Lecture notes for Wednesday, February 20
The lecture started with a video showing formation of kidney tubules by branching. Alveoli in the lungs, salivary glands, and some other anatomical structures are formed by a similar mechanism. This isn't my video, but it's available on YouTube.
We then returned to the figures on retino-tectal connections shown at the end of Monday's lecture. Roth's adhesion experiments were discussed, and the Ephrin / Ephrin receptor binding shown in the color figure at the bottom of Monday's notes.
We also discussed the paper by Watanabe and Kondo (2015) "Is pigment patterning in fish skin determined by the Turing mechanism?" Specifically, we talked about the Turing mechanism as a "pre-pattern" created by rules that determine concentration and diffusion of two chemicals (see lecture notes for February 15, in contrast to Watanabe and Kondo's studies of behavior of two different types of pigment cells in development of zebra fish. Do you agree with their conclusions?
Eugene Lehman, who was a faculty member here at UNC for many years, published papers in the 1950s on formation of pigment patterns in amphibians.
This isn't required, but the paper is available on line through the UNC library, and you may find it interesting. He was not aware of Turing's model when he did this work.