When tin expression becomes restricted to dorsal and ventral clusters that represent cardiac and visceral mesodermal cells at stage 11, there is a stronger expression of caup mRNA around the ventral clusters of tin-positive cells.

(Mirzoyan and Pandur, 2013)

caup transcript is expressed in both male and female genital discs of third instar larvae. Expression is more extensive and at a higher level in male than in female discs.

(Chatterjee et al., 2011)

Mirzoyan and Pandur (FBrf0222881) use an antibody which detects both ara and caup proteins, which have similar expression patterns (see transcript expression for ara and caup). During stage 13, single ara/caup-expressing cells form alongside the row of Mef2-positive myocardial cells, and are between the eve-positive pericardial cells by stage 15.

(Mirzoyan and Pandur, 2013)

Using an anti-caup antibody that recognizes both ara and caup, expression is detected in groups of cells in the presumptive visceral trunk mesoderm at early embryonic stage 11. By mid stage 11, they are expressed at the same dorsoventral level in the visceral mesoderm and the in the dorso-lateral ectoderm. Expression declines in the visceral mesoderm at late stage 11 and then is detected in the somatic mesoderm in promuscular clusters from which a subset of muscle progenitors expressing ara and caup will segregate in stage 12. Expression is maintained in sibling muscle founder myoblasts derived from araFBtr0091350:pb-XRcaup-expressing progenitors and in the muscles they give rise to, namely LT1-4, dorsal transverse 1, and segment border muscle. ara and caup muscle expression was compared that of several muscle identity genes.

(Carrasco-Rando et al., 2011)