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Tissue expression patterns of some silkworm SP and SPH genes showing tissue specificity on day 3 of the fifth instar. Semi-quantitative RT-PCR amplification of total RNA with BmSP(H)-specific oligonucleotides. Te, testis; Ov, ovary; He, head; Fa, fat body; In, integument; Mi, midgut; Ha, haemocyte; Ma, Malpighian tubules; Si, silk gland. The silkworm cytoplasmic actin A3 gene (Bmactin3; GenBank accession no. U49854) was used as internal control, and denoted by Bmactin3.
