Developmental tissue patterning and postdevelopmental homeostasis depend upon controlled delivery of cellular signals called morphogens. Morphogens act in a concentration- time-dependent manner to specify distinct transcriptional programs that instruct reinforce cell fate. One mechanism by which appropriate morphogen signaling thresholds are ensured is through the proteins specialized filopodia...

background: ultrasound propagation velocity was measured experimentally in normal, fibroadenoma and ductal carcinoma breast tissues, in order to distinguish normal breast tissue from tumors. materials and methods: in quantitative measurements of ultrasound velocity, 403 breast tissue images were selected, comprising 130 normal breast tissue, 130 fibroadenoma, and 143 ductal carcinoma tumors. th...