NEWHELIX, JUNE 1989 EDITION				22 June 1989

	This NEWHEL tape contains the NEWHELIX.FOR parameter calculating 
program, along with NEWHELIX.COM, which serves as an input control parameter 
file, an example of an input coordinate list NEWTEST.INP, and the resulting 
output tables, NEWTEST.OUT.  The example, C-G-C-G-C-G-T-T-T-T-C-G-C-G-C-G,
illustrates the ability of NEWHELIX to handle non-selfcomplementary sequences
and non-(purine/pyrimidine) mismatches (the two "TT pairs").

	If you received a mid-April copy of NEWHELIX.FOR, discard it, as
it was restricted to purine/pyrimidine pairs only and gave the wrong sign
for Y DSP.  The May edition corrected these signs.  The present June edition
calculates two useful new functions.  In the torsion angle tables, the 
quantity (epsilon-zeta) now is listed in the right column.  In the cylin-
drical tables, the little-used R(P) column has been replaced by the distance
between successive C1' atoms along one chain, measured in projection on a
plane perpendicular to the helix axis.  This is a useful measure of base 
overlap from one base to the next along a strand.  

	You should also have been sent a hard-copy manual: "NEWHELIX 
INSTRUCTIONS", consisting of 10 pages of instructions and several pages of 
examples of input/output.  If you do not have a copy, contact:

		Richard E. Dickerson
		Molecular Biology Institute
		U. C. L. A.
		Los Angeles CA 90024, U.S.A.
		(213)825-5864

	NEWHELIX now is consistent with the September 1988 Cambridge
Conventions on definitions and nomenclature.  I have also added to this tape
the four programs of the old HELIB package: AHELIX, BROLL, CYLIN and DTORAN,
also brought up to the Cambridge standards.  NEWHELIX is the program of choice
for all double-helical applications.  But the more flexible (if more tedious)
input format of the HELIB programs can be of value in special circumstances.