Jan wrote:
> but both RasMol and Chime draw backbone with *.CA protein structures and I
> think there is no reason why protein renderings which are only based on
> *.CA should not be drawn by Jmol e.g. trace.

Certainly *if* we change this then we will implement both backbone & trace
in Jmol.

>> >
>> >Q: How many files are out there that have alpha-carbons only?
>> >
>> quite a few - I don't have exact numbers.
>
> me too, I guess less than 1%, which are about 250 structures e.g.
>
> | code | resolution | method      | creation   |
>
> +------+------------+-------------+------------+
>
> | 1a1d |      99.99 | NMR         | 1997-12-10 |
>
> | 1a1q |        2.4 | diffraction | 1997-12-12 |
>
> | 1aat |        2.8 | diffraction | 1982-04-23 |
>
> | 1abn |        2.4 | diffraction | 1992-09-03 |
>
> | 1ae4 |        2.4 | diffraction | 1997-03-05 |
>
> | 1ags |        2.5 | diffraction | 1995-01-23 |
>
> | 1ain |        2.5 | diffraction | 1992-06-03 |
>
> | 1alm |      99.99 | model       | 1997-05-31 |
>
> | 1anp |      99.99 | NMR         | 1994-04-06 |
>
>
>
>
>
>>
>>
>> >Q: Why do they exist?
>> >
>> resolution limitations or file size issues.
>
> ancient files, resolution limitations and especially model structures .
> Regards, Jan

They all look like ancient files to me :-)

Miguel



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