For decades, the leading theory captured in these movies was the model. This theory suggests that a molecular "clock" oscillates in every cell, while a "wavefront" (a gradient of signaling molecules like FGF or WNT) moves down the embryo to tell the cells when to stop oscillating and form a solid segment. The Shift to PORD
Newer research, often cited in modern PSM imaging studies, suggests a different mechanism called the model. In PORD, the movement of the segment boundary is an emergent phenomenon driven by local cell-to-cell communication rather than a global gradient. Movies of these processes show that even if the tissue is cut or FGF signaling is inhibited, the "waves" can sometimes continue, supporting the idea of a self-organizing system. Why It Matters Capturing these processes on film allows researchers to: psm movie
When scientists talk about a "PSM movie," they are usually referring to . By tagging specific genes (like Lfng or Her1 ) with fluorescent proteins, researchers can record video of gene expression "waves" washing through the tissue. The Clock and Wavefront Model For decades, the leading theory captured in these
Public Service Media (PSM) refers to media organizations that are publicly owned and focused on providing credible news, education, and entertainment rather than commercial profit. In PORD, the movement of the segment boundary
The PSM is a region of tissue in a developing embryo located on either side of the neural tube. Its primary job is to undergo , the process of dividing into repeated segments called somites. These somites eventually become: Vertebrae (the spine) Skeletal muscle Dermis (skin) The Science of the "Movie"