load 1gzx.pdb
a = {*.N and connected(1, _C)}.label("%c").join(" ")
what this does:
1. Select the N-terminus (backbone N atoms connected to only one carbon)
{*.N and connected(1, _C)}
2. Create a list of labels consisting of only the chain code:
a = {*.N and connected(1, _C)}.label("%c")
3. Join that list with a space (instead of a new-line character)
a = {*.N and connected(1, _C)}.label("%c").join(" ")
result:
a = "A B C D"
number of them:
a = {*.N and connected(1, _C)}.label("%c").join("").size
Here we join them as "ABCD" and then just get the size of that, which is 4.
Bob Hanson
On 3/26/07, stefanie neumann <[EMAIL PROTECTED]> wrote:
> hi, is their a possibillity to get the number and names of the chains of the
> protein besides the possibilty to parse it out of the pdb-file??
> thanks, steffi
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