Table 1.

Drosophila oligonucleotide array: Expression data for wild-type embryos

Functional class	Number of genes on the chip (N)	Number of transcripts detected (n)	n/N × 100 (%)	Transcripts detected (%)
Metabolism	315	112	35.5	19.8
Transcriptional regulation	268	74	27.6	13.1
Cell surface receptors/CAMs/ion channels	181	63	34.8	11.1
Translation	60	52	86.6	9.2
Cytoskeleton/structural proteins	149	48	32.2	8.5
Signal transduction	107	41	38.3	7.2
RNA binding	59	29	49.1	5.1
Transcription/replication/repair	73	28	38.3	4.9
Unknown function	85	23	27.0	4.0
Proteolytic systems/apoptosis	62	22	35.4	3.9
Cell cycle	37	18	48.6	3.1
Transposable elements	35	18	51.4	3.1
Chromatin structure	36	18	50.0	3.1
Heat-shock proteins	18	10	55.5	1.7
Secreted proteins	34	7	20.5	1.2
	ΣN = 1519	Σn = 563

Genes expressed in stage 10–17 wild-type embryos raised under standard conditions (25°C), grouped according to functional classes. Number of genes within a functional group present on the chip (N); total number of genes represented on the chip, ΣN = 1,519. Number of genes expressed within a functional group (n); total number of transcripts detected Σn = 563. (n/N × 100 in %) Distribution of genes expressed within a functional group in relation to the total number of identified genes in this group present on the chip. Distribution of genes expressed within a functional group, given as percentage of the total number of genes expressed.