For at least a century biologists have been talking, mostly in a black‐box sense, about
developmental mechanisms. Only recently have biologists succeeded broadly in fishing out …

Embryonic skeletal development involves the recruitment, commitment, differentiation, and
maturation of mesenchymal cells into those in the skeletal tissue lineage, specifically …

Distal Regeneration and Symmetry Page 1 they have the same mass and lifetime?" Now with
parity violation both are recognized as K mesons, K1,2 and K1,38. L. W. Alvarez, FS Crawford …

The chicken Hox-4 homeogenes, like those of the mouse, are coordinately expressed in
partially overlapping domains during wing development. Local application of retinoic acid, a …

A new model for limb development which incorporates both outgrowth due to cell growth
and division, and interactions between morphogens produced in the zone of polarizing …

We postulate that positional information for secondary embryonic fields is generated by a
cooperative interaction between two pairs of differently determined cell types. Positional …

Spatial patterns of cellular differentiation may arise from cells first being assigned a position,
as in a coordinate system, and then interpreting the positional value that they have acquired …

Cartilage patterning and differentiation are prerequisites for skeletal development through
endochondral ossification (EO). Multipotential mesenchymal cells undergo a complex …

Local application of retinoic acid to the chick limb bud produces effects that are dose and/or
stage dependent. Low doses and/or old stages tend to give normal limbs or perhaps one or …

In many embryos, the removal of cells whose descendants would normally have formed
entire parts of the body pattern Is followed by apparently normal morphogenesis, which …