|
|
|
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
|
Fig. 5. hunchback transcript expression in germband embryos. Anterior is
upwards in all images. (A) Very early germband undergoing invagination. At
this stage, tissues fated to become head have not yet invaginated, and are
therefore not represented in this early germband preparation. hb
transcript in blocky chevron pattern in the early thorax. (B) Germband
invagination complete. Labial (LB) and third thoracic segment (T3) are
labeled. Note that hb does not accumulate in a gap-like pattern in
the labium, but rather in a segmentally reiterated blocky chevron pattern.
(C-F2) Germbands double stained for hunchback (purple) and
engrailed (orange). (C) Germband beginning elongation. Labial (LB)
and first abdominal (A1) segments are labeled. Arrows indicate two dots of
hb expression in the posterior zone. (D) Slightly later embryo than
in C, posterior dots of hb have now expanded to become a half-moon
patch in the posterior (arrow). (E) hunchback expression persists
throughout germband extension. The sixth abdominal segment (A6) is labeled.
Also note that hunchback is now expressed in a neural pattern in the
trunk of the germband. (F1) hunchback is expressed in the posterior
until the formation of the tenth abdominal segment (arrowhead). (F2) Close up
of posterior germband in (F1). Scale bars: 200 µm in A-F1.
|
