What's the difference between furrow and underfurrow?

Furrow

Definition:

(n.) A trench in the earth made by, or as by, a plow.
(n.) Any trench, channel, or groove, as in wood or metal; a wrinkle on the face; as, the furrows of age.
(n.) To cut a furrow in; to make furrows in; to plow; as, to furrow the ground or sea.
(n.) To mark with channels or with wrinkles.

Example Sentences:

(1) The contractile ring exists from about 20 sec after anaphase to the end of furrowing activity, i.e., 6-7 min at 20 degrees C. It is closely associated with the plasma membrane at all times, and is probably assembled there.
(2) Committing to ploughing a lone furrow without international agreement will damage our economy for little or no environmental benefit.
(3) The orientations of the cleavage spindles and the corresponding furrows' positions are assumed to be correlated to the field's temporal evolution which, in turn, is determined by flows of cytoplasmic components originated by the changes in the membrane shape.
(4) Some fields had lightly furrowed brows, others deep gullies and humpbacked hills.
(5) These observations suggest that the double strands on the P-face are registered with the grooves (type I or type II) on the complementary E-face and that a row of particles on the E-face is registered with a furrow-like region between two rows in the double strands on the P-face.
(6) New work is required to identify the signals from the mitotic spindle that specify the position of the furrow.
(7) Daballen navigates the jeep between thorn bushes and over furrows, guided by a rising moon and his intimate knowledge of the terrain.
(8) Near the end of first cleavage, membrane of the outer, pigmented surface of the embryo and a short band of membrane at the leading edge of the furrow displayed a high silver grain density, but the remainder of the furrow membrane was lightly labeled.
(9) We report the results obtained from 18 women whose facial folds and furrows were treated with augmentation therapy.
(10) The events that lead to the cell shape changes mediating ventral furrow formation require the transcription of zygotic genes under the control of twist and snail.
(11) Many leapt from the tyres they were swinging in to furrow their brows and howl in anger.
(12) During conversion of cells to protoplasts, plasma membrane invaginations were arranged end-to-end to form prolonged furrows which persisted until cell wall regeneration had been completed.
(13) 3-D-reconstructions of serial sections of human embryos show that the margin of the lip furrow band is irregular and consists of an abundance of individual epithelial excrescences.
(14) We then show that stimulatory signals of the right kind would induce furrows at the locations observed, in spherical cells as well as cells distorted by experimental manipulation.
(15) In gastrulae, spectrin accumulates near the embryo surface, especially at the forming amnioproctodeal invagination and cephalic furrow.
(16) The present observations indicate that the previous descriptions of the urodele carotid labyrinth should be corrected: a vascular ring exists around the common carotid artery and the latter shows a corresponding narrowing at the entrance to the carotid labyrinth; the vascular ring forms the most proximal part of the external carotid rete; the central chamber occupies only a part of the proximal end of the carotid labyrinth; the internal carotid rete and the external carotid rete constitute a continuous rete mirabile; and a distinct furrow exists in the boundary between these two portions of the rete mirabile.
(17) Injection of autologous adipose tissue removed via liposuction has been used clinically for facial contouring, the aging face, furrows, facial atrophy, acne scars, nasolabial folds, chin, and various other surgical defects.
(18) A cluster of facial actions comprised of brow bulging, eyes squeezed shut, deepening of the naso-labial furrow and open mouth was associated most frequently with the invasive procedure.
(19) Thus, the orientation of mitotic furrows depends on the internal polarity of the cell before mitosis.
(20) The semidominant and nonpleiotropic suppressors at four of the six loci display defective eye phenes themselves, and the phenotypically normal mutants at a fifth locus are suspected alleles of a gene represented by recessive furrowed eye mutants.