Bombyx Neuropeptide GPCRs Figure 3. Quantitative tissue expression analyses of Bombyx neuropeptide GPCRs on two larval stages. Transcript levels of the GPCR genes are presented as arbitrary units. See Figure 2 for the abbreviated GPCR names. IV-HCS, fourth instar head capsule slippage; V-2, fifth instar day 2; CC-CA, corpora cardiaca-corpora allata complex; PG, prothoracic gland; BR, brain; FB, fat body; MG, midgut; EP, epidermis; MU, muscle; MP, Malpighian tubule; SiG, silk gland; SG, salivary gland; TE, testis; OV, ovary. doi:10.1371/journal.pone.0003048.g003 PLoS ONE | www.plosone.org 7 August 2008 | Volume 3 | Issue 8 | e3048