The phrase "a valid start" is correct and usable in written English.
You can use it when referring to an acceptable or reasonable beginning point for a discussion, project, or process.
Example: "While the proposal needs more detail, it's a valid start for our upcoming project."
Alternatives: "a good beginning" or "an acceptable initiation".
In order to be considered as a valid gene (or a valid genome in the case of viruses, since they possess a single known ORF), a given ORF should not be classified as a hypothetical product, start with a valid start codon, end with a valid stop codon, have a length multiple of three, and have no ambiguous bases, here considered as a non-standard (A, C, T or G) nucleotide.
The ribosomal protein L12ae gene (Smar_1096) does not have a valid start codon, but this is likely to be an essential gene.
(ii) All transcripts with PTCs in human were removed and likewise for transcripts lacking a valid start (M or L) or stop codon in human.
(iii) Transcripts lacking a valid start codon in the chimpanzee were removed since such transcripts were not likely to be coding.
This start sequence is critical and must be of sufficient length to synchronize the reception protocol and uniquely distinguish between a valid start-of-message and noise.
The approaches used in the study can serve as a valid starting point for further development of such tools and methods compatible with planners' ordinary working modes.
That's because it's a model of several interacting markets, and you can enter from multiple directions, any one of which is a valid starting point.
The question the paper asks is whether the conventional wisdom suggesting a prominent and growing role of energy in US diplomatic efforts is a valid starting point, given the realities of the US energy sector and the domestic and global energy markets.
Hegel's claim that there is more philosophy in science than scientists are usually aware of, or willing to acknowledge (1830/1970, p. 11), remains a valid starting point.
Therefore, the proposed scenario is usually considered for investigating the impact of different dynamic spectrum allocation policies for interference avoidance in femtocell environments, and the proposed analysis represents a valid starting point for studies in this direction.
Thus, the enzyme conformations assigned to the various steps might represent a valid starting point for the development of inhibitors disrupting the enzyme dynamics and thus inactivating it by freezing it in one conformer and avoiding the cycle to evolve further.
