Bacterial appendages and adhesins responsible for the linkage of the first pioneering cells to the surface (or the conditioning film) are potential targets for antiadhesion molecules grafted or smeared on the surface.
Alternatively, the large runs of these few cells may be an efficient food seeking strategy of the species, because such pioneering cells move far away from the population of competing cells, and find new patches of food to disperse the genetic content of the Dictyostelium clone.
This pioneer cell starts growth and proliferation to form a small 3-dimensional collection of randomly oriented cells.
Zebrafish embryos lacking Ntla form floor plate (fp) at the expense of notochord, which results in a difference in muscle segment shape and a lack of muscle pioneer cell development (Halpern et al., 1993).
Once its pioneer cells are established, clumps of the algae bloom first on rocks, then cover river bottoms with a fibrous mat that can choke out the insect life that is trout food.
Figure 4O and 4P respectively show the quantitative data of slow muscle fibers and muscle pioneer cells per somite.
prdm15 is observed to be expressed in cranial ganglia neurons (Figure 6Da' and b') as well as in muscle pioneer cells and intermediate cell mass (a and b) at 18 and 22 hpf.
The 4d9 antibody used 1∶100 dulution, which recognizes the engrailed protein in the nuclei of muscle pioneer cells, the F59 antibody used 1∶100 dilution, which labels slow myosin heavy clain (MyHC) in zebrafish [30], were obtained from the Developmental Studies Hybridoma Bank.
Within this cluster, prdm4 is highly expressed in somites and retina at 24 48 hpf (Figure 5Bk and l), while prdm15 is expressed in muscle pioneer cells (a type of non-migratory adaxial cells) at 18 24 hpf (Figure 5Bm, m' and n).
To assess the role of Dmrt2b in slow muscle development, we further analyzed the expression affect of Dmrt2b knockdown on slow muscle markers by using F59 antibody which labels slow myosin heavy clain (MyHC) in zebrafish [30] and 4D9 antibody which recognizes the engrailed protein in the nuclei of muscle pioneer cells.
