TABLE 3.

Functional categories of T4 genes^a

A.	Transcription [red]
	asiA, dsbA, goF, modA, motA, motB, mrh, rpbA, srd, srh, 33, 55 (alc, alt, 45)
B.	Translation [brown]
	cef, dmd, modB, regA, regB, vs, rnlA, rnlB (modA), tRNAR, tRNAI, tRNAT, tRNAS, tRNAP, tRNAG, tRNAL, tRNAE; rnaC, rnaD
C.	Nucleotide metabolism [orange]
	cd, denA, denB, frd, nrdA,B,C,D,G,H, nudE, pseT, td, tk, 1, 42, 56
D.	DNA replication, recombination, repair, packaging, and processing [yellow]
	dda, denV, dexA, repEA, repEB, rnh, uvsW, uvsX, uvsY, 16, 17, 30, 32, 39, 41, 43, 44, 45, 46, 47, 49, 59, 52, 60, 61/58, 62
E.	Virion proteins [blue]
	Head: soc, hoc, inh, ipI, ipII, ipIII, 2, 4, 20, 23, 24, 67, 68, (22, 21) [dark blue]
	Neck: 13, 14 [medium blue]
	Tail: 3, 5, 6, 7, 8, 9, 10, 11, 12, 15, 18, 19, 25, 26, 27, 28, 29, 48, 53, 54 [light blue]
	Tail fiber: wac, 34, 35, 36, 37 (rnlA) [pale blue]
F.	Chaperonins/assembly catalysts [stippled blue]
	21, 22, 31, 38, 40, 51, 57A, rnlA
G.	Lysis [green]
	e, rI, rIII, sp, t (rIIA, rIIB)
H.	Host or phage interactions [purple]
	ac, arn, α-gt, β-gt, dam, imm, pin, rIIA, rIIB, stp, (gol, pseT, rnlA)
I.	Host alteration/shutoff [pink]
	alc, alt, gol, ndd (denA, denB, modA, modB)
J.	Homing endonucleases and homologs [peach]
	I-TevI-III, mobA-mobE, segA-segG
K.	Predicted integral membrane or periplasmic proteins [squiggle]
	denB.-1, e.2, e.3, e.4, ndd.3, ndd.4, ndd.5, nrdC.7, pseT.3, tRNA.4, 47.1, 52.1, 55.8 (ac, imm, rI, t, 7, 29)
L.	Unknown function [white]

^aGenes in parentheses appear in another, primary category. Primary functional assignments and the corresponding colors are used in Fig. 3.