Table 2.

Diversity of housekeeping gene products found to be enriched in the larval SG, grouped by functional annotation.

Functional category	No. of probes	No. of transcripts
Hypothetical conserved proteins of unknown function	36	43
Protein export machinery	35	37
Protein modification machinery	31	36
Signal transduction	28	35
Transporters	19	20
Conserved membrane proteins of unknown function	17	20
Carbohydrate metabolism	12	14
Proteasome machinery	10	10
Protein synthesis machinery	9	9
Transcription machinery	5	5
Lipid metabolism	5	6
Cytoskeletal proteins	5	8
Transcription factors	4	5
Nuclear regulation	4	4
Intermediate metabolism	3	3
Lisosomal proteins and enzymes	3	5
Energy metabolism	3	3
Extracellular matrix proteins	2	2
Heme metabolism	1	1
Amino acid metabolism	1	2